| L | Laufende Behandlung|| | Ongoing treatment | Laufende Behandlung | Traitement en cours | Details |
| L | Length | | | | Details |
| L | Laterolog | | | | Details |
| L | lower {as qualifier) | | | | Details |
| l | lower | | | | Details |
| L | Focused | | | | Details |
| L | Guard | | | | Details |
| L | Lateral | | | | Details |
| l | liter | | | | Details |
| L | Sonolog | | | | Details |
| L | Steel pads with tungsten carbide inserts | | | | Details |
| L | L Unwirtschaftlich, fördert aus Lagerstättengründen | | | | Details |
| L | Liquidiert | Plug & Abandoned | | | Details |
| L | Laufende Behandlung | Well Intervention | | | Details |
| L | Legal | | | | Details |
| L | Liquid | | | | Details |
| L | Liquid i.e. volume at surface conditions | | | | Details |
| L | liter | | | | Details |
| L | liter | | | | Details |
| LRMC | Long Run Marginal Cost|| | Long Run Marginal Cost | Long Run Marginal Cost | Long Run coût marginal | Details |
| GLZ | Gleitzeit|| | flextime | Gleitzeit | flextime | Details |
| LA | Laufende|| | Ongoing | laufend | En cours | Details |
| LG | Lift Gas|| | Lift gas | Liftgas | gaz Ascenseur | Details |
| mbbl | Million Barrels|| | million barrels | Millionen Barrel | millions de barils | Details |
| VGL | Vergleichen|| | Compare | Vergleichen | Comparer | Details |
| LFA | Laufende|| | Ongoing | laufend | En cours | Details |
| Bleiabdruck | Impression Block|| | impression block | Eindruck Block | bloc d'impression | Details |
| MLD | Mengen, Leistung, Dokumentation|| | Quantities, performance, documentation | Die Mengen, Leistung, Dokumentation | Quantités, performances, documentation | Details |
| RGL | Rohr- und Gerätelager|| | Pipe and equipment storage | Rohr- und Ausrüstung Lagerung | Tuyaux et équipements de stockage | Details |
| LA | Laufende Behandlungen|| | Ongoing treatments | Laufende Behandlungen | traitements en cours | Details |
| LAE | Laufende Behandlungen Energize|| | Ongoing treatments Energize | Laufende Behandlungen Energize | traitements en cours Energize | Details |
| LI | Liquidationen|| | liquidations | Liquidationen | liquidations | Details |
| MLT | Multi Logging Tool|| | Multi Logging Tool | Multi Logging Tool | Outil multi Logging | Details |
| SL | Stream Line|| | Streamline | Rationalisieren | Rationaliser | Details |
| 3DSL | 3 Dimentional Stream Line|| | 3 Dimentional Streamline | 3 Dimentional Stream | 3 Dimentional Streamline | Details |
| HSLA | High Strength Low Alloy|| | High Strength Low Alloy | High Strength Low Alloy | Haute résistance faiblement allié | Details |
| LCF | low cycle fatigue|| | low cycle fatigue | LCF | fatigue oligocyclique | Details |
| MFL | Magnetic Flux Leakage|| | Magnetic Flux Leakage | Magnetic Flux Leakage | Fuites de flux magnétique | Details |
| Pegel | Level|| | level | Ebene | niveau | Details |
| TLW | Teilweise|| | Partially | Teilweise | Partiellement | Details |
| $/gal | U.S. dollars per gallon | | | | Details |
| $/lb | U.S. dollars per pound | | | | Details |
| µg/L | micrograms per liter | | | | Details |
| 2CAL | 2-Arm Caliper Log | | | | Details |
| 2LoT | 2nd Law of Thermodynamics | | | | Details |
| 3CAL | 3-Arm Caliper Log | | | | Details |
| 4CAL | 4-Arm Caliper Log | | | | Details |
| A CHL | Atlantic Chlorinlog | | | | Details |
| A/CLD | air cooled | | | | Details |
| A/CLR | air cooler | | | | Details |
| AAL | Acoustic Amplitude | | | | Details |
| AAPL | American Association of Petroleum Landmen | | | | Details |
| AAPL | American Association of Professional Landmen | | | | Details |
| abd loc | abandoned location | | | | Details |
| ABHL | absolute bottom hole location | | | | Details |
| ABHL | absolute bottom-hole location | | | | Details |
| AC PAR L | Acoustic Parameter-Logging | | | | Details |
| AC/CAL | Acoustilog Caliper Gamma Ray Neutron | | | | Details |
| AC/CAL | BHC Acoustilog Caliper | | | | Details |
| AC/CAL | BHC Acoustilog Caliper (Thru Casing) | | | | Details |
| AC/CAL GR | Acoustilog Caliper Gamma Ray | | | | Details |
| AC/CAL NEU | Acoustilog Caliper Neutron | | | | Details |
| AC/CAL/ | BHC Acoustilog Caliper G/R Neutron | | | | Details |
| AC/CAL/GR | BHC Acoustilog Caliper Gamma Ray | | | | Details |
| ACAL | AcoustiCaliper | | | | Details |
| ACCEL | accelerometers | | | | Details |
| ACL | Access Control List | | | | Details |
| ACL | Long-Spaced BHC Acoustilog | | | | Details |
| ACLR | air cooler | | | | Details |
| ACSL | Acoustic | | | | Details |
| addl | additional | | | | Details |
| ADL | above detection level | | | | Details |
| ADSL | Asymmetrical Digital Subscriber Line | | | | Details |
| AEGPL | Assn. Europeenne des Gaz de Petrole Liquifies France | | | | Details |
| AEPL | Albario Engineering (Pvt) Ltd | | | | Details |
| AF/CLR | after cooler | | | | Details |
| AFLASTM | a high temperature seal elastomer | | | | Details |
| AFLD | Annular Fluid Loss Device (ie Halliburton's Twin Flow tool) | | | | Details |
| AGTL | Alberta Gas Trunkline Co., LTD. | | | | Details |
| AHL | Amerada Hess Ltd. UK | | | | Details |
| AL | Appraisal Licence (United Kingdom), a type of onshore licence issued before 1996 | | | | Details |
| AL | Air Line (in air driling or UBD/MPD drilling) | | | | Details |
| AL | Artificial Lift | | | | Details |
| AL | ALBANIA | | | | Details |
| Al | Alabama | | | | Details |
| AL | aluminum | | | | Details |
| ALA | ALAND ISLANDS | | | | Details |
| ALARA | as low as reasonably achievable | | | | Details |
| ALARP | As Low As Reasonably Practicable | | | | Details |
| ALARP | As Low As Reasonably Practical | | | | Details |
| ALAT | Azimuthal Laterolog | | | | Details |
| ALB | ALBANIA | | | | Details |
| Alb | Albany | | | | Details |
| Alba | Aluminium Bahrain BSC | | | | Details |
| ALBPETROL | Albanian Petroleum Corporation Albania | | | | Details |
| ALC | Vertical Seismic Profile Acoustic Log Calibration Report | | | | Details |
| ALC | Agricultural Land Commission (see comment) | | | | Details |
| alc | alcoholic | | | | Details |
| ALC | Acoustilog | | | | Details |
| ALC-GR | Acoustilog Caliper-Gamma Ray | | | | Details |
| ALC-GRN | Acoustilog Caliper-Gamma Ray-Neutron | | | | Details |
| ALC-N | Acoustilog Caliper-Neutron | | | | Details |
| ALCOA | Aluminum Company of America | | | | Details |
| ALD | Azimuthal Litho Density (logging control) | | | | Details |
| ALD | Azimuthal Litho Density | | | | Details |
| ALEPCO | Ste. Algero-Arab-Libyenne d’Exploitation et de Production des Produits Petroliers Algeria | | | | Details |
| ALG | Algerian | | | | Details |
| alg | along | | | | Details |
| alg | algae | | | | Details |
| ALICO | American Life Insurance Company | | | | Details |
| ALIGN | alignment(ing) | | | | Details |
| alk | alkaline, alkalinity | | | | Details |
| Alkyd | a resin formed by reaction of polyhydric alcohols and polybasic salts Saturated or unsaturated oils or fats are involved | | | | Details |
| alkyl | alkylate, alkylation | | | | Details |
| ALLOW | allowable, allowance | | | | Details |
| alm | alarm | | | | Details |
| ALOC | allocation | | | | Details |
| ALR | Acoustic Log Report | | | | Details |
| ALR | Agricultural Land Reserve (see comment) | | | | Details |
| ALS | Artificial Lift System | | | | Details |
| alt | alternate | | | | Details |
| ALT | altitude | | | | Details |
| ALU | ALUminium | | | | Details |
| ALU | Arithmetic Logic Unit | | | | Details |
| Alum | aluminum and potassium sulfate compound Used was water clairfying | | | | Details |
| ALY | alloy | | | | Details |
| Aminoil | American Independent Oil Company | | | | Details |
| AMPOL | Australian Petroleum Pty. Ltd. Australia | | | | Details |
| AMSL | above mean sea level | | | | Details |
| anal | analysis, analytical | | | | Details |
| Angul | Angulogerina | | | | Details |
| AOPL | Association of Oil Pipe Lines | | | | Details |
| appl | appliance | | | | Details |
| appl | applied | | | | Details |
| applic | application | | | | Details |
| AQL | acceptance quality level | | | | Details |
| ARACL | Array Acoustic Log | | | | Details |
| ARKLA | Arkansas Louisiana Gas Co. | | | | Details |
| ARPEL | Assistencia Reciproca Petrolera Empresarial Latinoamerica Regional Assn. of Oil & Natural Gas Cos. in Latin America and the Caribbean)(—) | | | | Details |
| ASL | Arab Super Light | | | | Details |
| ASL | Amplitude Sonic | | | | Details |
| ASL | Acoustic Scope Picture | | | | Details |
| ASL | Fracture Finder | | | | Details |
| ASLD | Azimuthal Stabilized Litho Density | | | | Details |
| ASLE | American Society of Lubricating Engineers | | | | Details |
| ASRL | Alberta Sulfur Research Ltd | | | | Details |
| ATLANTICO | Compania Espanola de Petroleos Atlantico S.A. Spain | | | | Details |
| avail | available | | | | Details |
| AVL | Acoustic Velocity | | | | Details |
| B.Bl | Base Blane | | | | Details |
| B.Ls | Big Lime | | | | Details |
| B/L | bill of lading | | | | Details |
| B/Vlv | ball valve | | | | Details |
| bail | bail, bailed | | | | Details |
| bail | bail(ed) | | | | Details |
| BAL | Bond Attenuation Log | | | | Details |
| BAL | balance | | | | Details |
| BAL | Bound Attenuation Log | | | | Details |
| Ball | Balltown sand | | | | Details |
| Batelco | Bahrain Telecommunications Co. | | | | Details |
| BAWUL | barrels acid water under load | | | | Details |
| bbl | barrel | | | | Details |
| Bbl | a Standard Oil measure of 42 gallons, originally known as a blue barrel and abbreviated bbl 016 m3 | | | | Details |
| bbl | barrels | | | | Details |
| bbl | Barrels (of oil) | | | | Details |
| bbl/cd | barrels per calendar day | | | | Details |
| bbl/sd | barrels per stream day | | | | Details |
| bbl/yr | barrels per year | | | | Details |
| BBLs | barrels of oil | | | | Details |
| BDL | Bit Data Log | | | | Details |
| BDL | below detection level | | | | Details |
| BDL | bundle | | | | Details |
| BD-MLW | barge deck to mean low water | | | | Details |
| BEL | BELGIUM | | | | Details |
| Bel | Beldon | | | | Details |
| Bel-C | Belle City | | | | Details |
| Bel-F | Belle Fourche | | | | Details |
| Belm | belemnites | | | | Details |
| BERL | Boral Energy Resources Ltd. Australia | | | | Details |
| BFL | baffle | | | | Details |
| BGEPIL | British Gas Exploration and Production (India) Limited | | | | Details |
| BGL | Below ground level (used as a datum for depths in a well) | | | | Details |
| BGL | Borehole Geometry Log | | | | Details |
| BHC AL TC | BHC Acoustilog Caliper (Thru Casing) | | | | Details |
| BHC ALC | BHC Acoustilog Caliper | | | | Details |
| BHC ALC GR | BHC Acoustilog Caliper Gamma Ray | | | | Details |
| BHC ALC GRN | BHC Acoustilog Caliper G/R Neutron | | | | Details |
| BHC ALC N | BHC Acoustilog Caliper Neutron | | | | Details |
| BHC ALGRNTC | BHC Acoustilog Caliper G/R Neutron (Thru Casing) | | | | Details |
| BHC-WFL | Wave Form Logging | | | | Details |
| BHL | Borehole Log | | | | Details |
| BHL | bottom hole location | | | | Details |
| BHL | bottom-hole location | | | | Details |
| BIVDL | BI/DK/WF/Casing Collar Locator/Gamma Ray Log | | | | Details |
| BKFLSH | back flush | | | | Details |
| Bl | Bohrloch (borehole…, the hole…) | | | | Details |
| BL | BaLe | | | | Details |
| BL | BOLIVIA | | | | Details |
| BL | SAINT BARTHELEMY | | | | Details |
| BL | balance line | | | | Details |
| BL | barrels load | | | | Details |
| bl | blue | | | | Details |
| BL&AW | barrels load & acid water | | | | Details |
| Bl/Cb | blast cabinet | | | | Details |
| BL/JT | blast joint | | | | Details |
| BLC | Big Lever Club (Contracting) | | | | Details |
| BLC | barrels load condensate | | | | Details |
| BLCPD | barrels load condensate per day | | | | Details |
| BLCPH | barrels load condensate per hour | | | | Details |
| bld | bailed | | | | Details |
| bld | bleeding | | | | Details |
| BLD-FLG | BF blind flange | | | | Details |
| bldg | building | | | | Details |
| bld-gas | bleeding gas | | | | Details |
| bldg-drk | building derrick | | | | Details |
| bldg-rds | building roads | | | | Details |
| bldo | bleeding oil | | | | Details |
| bldrs | boulders | | | | Details |
| BLE | bevel large end | | | | Details |
| bledg | bleeding | | | | Details |
| BLF | Banque Libano-Française | | | | Details |
| blg | bailing | | | | Details |
| BLI | Bottom of Logging Interval | | | | Details |
| Blin | Blinebry | | | | Details |
| blK | black | | | | Details |
| BLK | Block | | | | Details |
| BLKD | Bulk Density | | | | Details |
| Blk-Lf | Black Leaf | | | | Details |
| Blk-Li | Black Lime | | | | Details |
| blk-lnr | blank liner | | | | Details |
| BLM | SAINT BARTHELEMY | | | | Details |
| BLM | US Bureau of Land Management | | | | Details |
| BLM | Bureau of Land Management | | | | Details |
| BLND | blend(ed)(er)(ing) | | | | Details |
| BLO | barrels of load oil | | | | Details |
| BLO | barrels load oil | | | | Details |
| blo | blow | | | | Details |
| BLOM | Banque du Liban et d’Outre-Mer | | | | Details |
| BLOPD | barrels of load oil per day | | | | Details |
| BLOPD | barrels load oil per day | | | | Details |
| BLOPH | barrels of load oil per hour | | | | Details |
| BLOPH | barrels load oil per hour | | | | Details |
| BLOR | barrels load oil recovered | | | | Details |
| Blos | blossom | | | | Details |
| BLOTBR | barrels load oil to be recovered | | | | Details |
| BLOYTR | barrels load oil yet to recover | | | | Details |
| BLPD | Barrel Liquid Per Day | | | | Details |
| BLPD | barrels of liquid per day | | | | Details |
| BLR | BELARUS | | | | Details |
| blr | bailer | | | | Details |
| BLR | boiler | | | | Details |
| BLS | Basic Life Support | | | | Details |
| BLS | Bureau of Labor Statistics | | | | Details |
| BLTR | barrels of load to recover | | | | Details |
| blts | bullets | | | | Details |
| blu | blue | | | | Details |
| BLUE | Best Linear Unbiased Estimator | | | | Details |
| BLW | barrels of load water | | | | Details |
| BLW | barrels load water | | | | Details |
| BLWPD | barrels of load water per day | | | | Details |
| BLWPD | barrels load water per day | | | | Details |
| BLWPH | barrels of load water per hour | | | | Details |
| BLWPH | barrels load water per hour | | | | Details |
| BLWR | blower | | | | Details |
| BLWTR | barrels load water to recover | | | | Details |
| BLZ | BELIZE | | | | Details |
| BML | Below Mud Line (Subsea measurement) | | | | Details |
| BMSL | Below Mean Sea Level | | | | Details |
| BNGL | Barrels of natural gas liquids | | | | Details |
| BNOCL | Barbados National Oil Company Ltd. Barbados | | | | Details |
| BOL | Back On Line | | | | Details |
| BOL | BOLIVIA | | | | Details |
| Bol. | Bolivarensis | | | | Details |
| Bol.a. | Bolivina a. | | | | Details |
| Bol.flor. | Bolivina floridana | | | | Details |
| Bol.p. | Bolivina perca | | | | Details |
| BOMINFLOT | KG Bominflot Bunkergas fuer Mineraloele mbH & Co. Germany | | | | Details |
| BOTHL | Bottom Hole Locator Log | | | | Details |
| BP/CLR | bypass cooler | | | | Details |
| BPCL | Bharat Petroleum Corporation Limited | | | | Details |
| BPFL | Borehole Profile Log | | | | Details |
| BPLO | barrels of pipeline oil | | | | Details |
| BPLOPD | barrels of pipeline oil per day | | | | Details |
| BPLUG | Baker Plug | | | | Details |
| BQL | B/QL Log | | | | Details |
| Br.ld. | Break load | | | | Details |
| BRFL/V | butterfly valve | | | | Details |
| Brn Li | brown lime | | | | Details |
| BRPLG | Bridge Plug Log | | | | Details |
| brtl | brittle | | | | Details |
| BSL | Below Sea Level | | | | Details |
| Bsl | basal | | | | Details |
| BSL | Borehole Compensated Sonic | | | | Details |
| Bslt | base of the salt | | | | Details |
| BSML | below sea mean level | | | | Details |
| BSPL | base plate | | | | Details |
| Bt·l | barrels of mud | | | | Details |
| BTFL/V | butterfly valve | | | | Details |
| BTHL | Bottom Hole Log | | | | Details |
| BTL | Biomass-to-liquid | | | | Details |
| BTL | Borehole Televiewer | | | | Details |
| BTL | Bantry Terminals Ltd. Ireland | | | | Details |
| Btu/lb | British thermal units per pound | | | | Details |
| BTWLD | butt weld | | | | Details |
| BUL | bottom up lag | | | | Details |
| Bul.text. | Buliminella textularia | | | | Details |
| Bull-W | Bull wagon | | | | Details |
| BV/WLD | beveled for welding | | | | Details |
| BWL | barrel water load | | | | Details |
| BWL | body wall loss | | | | Details |
| BWOL | barrels water over load | | | | Details |
| C limit | or Ceiling limit | | | | Details |
| C/L | Control Line (the hydraulic line for controling SSSV and chemical injection in completion) | | | | Details |
| C/L | center line | | | | Details |
| Cable | one of various braided cables, with or without isolated conductance wires, used for well operations | | | | Details |
| CaCl2 | calcium chloride salt | | | | Details |
| CAL | Caliper | | | | Details |
| CAL | Computed Gafillla | | | | Details |
| CAL | Section Gauge | | | | Details |
| CAL | Country Alert Level | | | | Details |
| cal | calcite, calcitic | | | | Details |
| cal | caliche | | | | Details |
| CAL | caliper log | | | | Details |
| cal | caliper survey | | | | Details |
| cal | calorie | | | | Details |
| CAL | Caliper Logging | | | | Details |
| CAL | Computer Analyzed Log | | | | Details |
| CAL | Four-Arm Caliber Log | | | | Details |
| CAL | Perforation Depth Control Log | | | | Details |
| CAL | Caltex Australia Ltd. Australia | | | | Details |
| CALA | Calipet Analysis | | | | Details |
| CALA | Caliper Analysis | | | | Details |
| calc | calcareous | | | | Details |
| CALC | Caliper Curve | | | | Details |
| Calc | calcareous, calcerenite | | | | Details |
| Calc | calcium | | | | Details |
| Calc | calculate(ed), calculation | | | | Details |
| calc | gr calcium-base grease | | | | Details |
| CALD | Caliper interpreted from Density | | | | Details |
| cale | calceneous | | | | Details |
| CALI | Caliper Log | | | | Details |
| CALI | Generalized Caliper | | | | Details |
| CALI | General Caliper | | | | Details |
| CALIBR | calibrate, calibration | | | | Details |
| CALIL | Caliper Log | | | | Details |
| CALOG | Circumferential Acoustic Log | | | | Details |
| CALP | Caliper | | | | Details |
| CALTEX | Various affiliates of Texaco Inc, and Chevron Corp. partnership — | | | | Details |
| Calv | Calvin | | | | Details |
| CALVE | Calibrated Velocity Log Data | | | | Details |
| CAMEL | Companie Algerienne du Methane Liquide France/Algeria | | | | Details |
| CANL | Computer Analysis | | | | Details |
| CASL | Computer Acoustic | | | | Details |
| CAVL | Compensated Acoustic Velocity | | | | Details |
| CBIL | CBIL Log | | | | Details |
| CBIL | Circumferential Borehole Imaging Log | | | | Details |
| CBL | Cement Bond Log (measurement of casing cement integrity) | | | | Details |
| CBL | Cement Bond Log | | | | Details |
| CBL | Acoustic Cement Bond | | | | Details |
| CBL | cable(ing) | | | | Details |
| CBL | Cement Bond Logging | | | | Details |
| CBL | Acoustic Cement Bond Log | | | | Details |
| CBL GRN | Acoustic Cement Bond G/R Neutron | | | | Details |
| CBL N | Acoustic Cement Bond Neutron | | | | Details |
| CBL/GR | Acoustic Cement Bond Gamma Ray | | | | Details |
| CBL/GR/NEU | Acoustic Cement Bond G/R Neutron | | | | Details |
| CBL/NEU | Acoustic Cement Bond Neutron | | | | Details |
| CBL-GR | Cement Bond-Gamma Ray Logging | | | | Details |
| CBL-GRN | Cement Bond-Gamma Ray Neutron | | | | Details |
| CBL-N | Cement Bond-Neutron | | | | Details |
| CBL-VD | Variable Density Logging | | | | Details |
| CBL-VD | Cement Bond-Variable Density Logging | | | | Details |
| C-Cal | contact caliper | | | | Details |
| CCL | Casing Collar Locator | | | | Details |
| CCL | casing collar locator log | | | | Details |
| CCL | Casing Collar | | | | Details |
| CCL | Perforation Depth Control Log | | | | Details |
| CCLGO | cat-cracked light gas oil | | | | Details |
| CCLP | Casing Collar Locator Perforation | | | | Details |
| CCLTP | Casing Collar Locator Through Tubing Plug | | | | Details |
| CDCL | Compensated Densilog Caliper | | | | Details |
| CDCL GR | Compensated Densilog Caliper Gamma Ray | | | | Details |
| CDL | Compensated Density Log | | | | Details |
| CDL | compensated formation density log | | | | Details |
| CDL | Compensat ed Density | | | | Details |
| CDL | Compensated Density | | | | Details |
| CDL | cut drilling line | | | | Details |
| CDL | Compensated Densilog | | | | Details |
| CDL/CAL | Compensated Densilog Caliper | | | | Details |
| CDL/CAL/ | Compensated Densilog Caliper | | | | Details |
| CDL/CAL/GR | Compensated Densilog Caliper | | | | Details |
| CDL/CAL/GR | Densilog Caliber Gamma Ray Log | | | | Details |
| CDL/CAL/ML | Compensated Densilog Caliper Minilog | | | | Details |
| CDLC GRN | Compensated Densilog Caliper G/R Neutron | | | | Details |
| CDLC M | Compensated Densilog Caliper Minilog | | | | Details |
| CDLC N | Compensated Densilog Caliper Neutron | | | | Details |
| CD-PL | cadmium plate | | | | Details |
| CDRCL | Compensated Dual Resistivity Cal. Log | | | | Details |
| CEHL | Cain Energy Hydrocarbons Limited | | | | Details |
| CEIL | Cairn Energy India Limited | | | | Details |
| CEL | cement evaluation log | | | | Details |
| CEL | Cement Evaluation | | | | Details |
| cell | cellar | | | | Details |
| cell | cellular | | | | Details |
| CERCLA | a US Law – Comprehensive Environmental Response, Compensation and Liability Act of 1980 | | | | Details |
| CERCLA | Comprehensive Environmental Response, Compensation, and Liability Act (The Superfund Law) | | | | Details |
| CGEL | CG EL Log | | | | Details |
| CGL | Core Gamma Log | | | | Details |
| cglt | conglomerate, conglomeritic | | | | Details |
| CGTL | Compact Gas to liquids (production equipment small enough to fit on a ship) | | | | Details |
| chal | chalcedony | | | | Details |
| CHL | CHILE | | | | Details |
| CHL | cased hole log | | | | Details |
| chl | chloride | | | | Details |
| chl | chloride(s) | | | | Details |
| chl | chloritic | | | | Details |
| chl | log chlorine long | | | | Details |
| CHL | Chlorinlog | | | | Details |
| CHL GR | Chlorinlog-Gamma Ray | | | | Details |
| CHL GR | Chlorinlog-Gamma Ray | | | | Details |
| CHLR | chlorinator | | | | Details |
| CHNL | Channel Survey | | | | Details |
| CHNL | channel | | | | Details |
| CIDL | chemical injection downhole lower | | | | Details |
| CILD | Conduction Log | | | | Details |
| CL | Core Log | | | | Details |
| CL | Control Line (the hydraulic line for controling SSSV and chemical injection in completion) | | | | Details |
| CL | CORAL SEA ISLANDS | | | | Details |
| CL | CHILE | | | | Details |
| CL | control line | | | | Details |
| CL | Chloride | | | | Details |
| CL | Chlorine or Chlorinilog | | | | Details |
| CL | Salinity | | | | Details |
| CL | carload | | | | Details |
| cl | centiliter | | | | Details |
| CL | class | | | | Details |
| CL | Salinity | | | | Details |
| CL&F | Continental Land and Fur Co. | | | | Details |
| Cl2 | chlorine gas | | | | Details |
| Cl2 | chlorine | | | | Details |
| CLA | Collective Labor Agreement | | | | Details |
| Clag | Clagget | | | | Details |
| Claib | Claiborne | | | | Details |
| Clarks | Clarksville | | | | Details |
| clas | clastic | | | | Details |
| CLAS | Clay Analysis and Shaly Sand Evaluation (CLASS®) | | | | Details |
| CLASS | classification | | | | Details |
| Clav | Clavalinoides | | | | Details |
| Clay | a fine grain (<000015” or about 4 microns) – finely crystalline silica sheet minerals Usually of silicate composition In oil field terms, the most common clays are Smectite (montmorillinite), illite, kaolinite and chlorite The characteristic for authogenic clay is to have extremely high surface area-to-volume ratio | | | | Details |
| Clay | Clayton | | | | Details |
| Clay | Claytonville | | | | Details |
| CLAY | Clay Description (CLAYS) | | | | Details |
| CLC | Civil Liability Convention | | | | Details |
| CLDL | Chlorije Detection | | | | Details |
| CLDL | Chloride Detection | | | | Details |
| Cleve | Cleveland | | | | Details |
| Clfk | Clearfork | | | | Details |
| CLFP | choke line friction pressureClinker | | | | Details |
| CLFR | clarifier | | | | Details |
| CLG | Core Log and Graph | | | | Details |
| CLG | cooling | | | | Details |
| CLG/TWR | cooling tower | | | | Details |
| CLGB | Credit Lyonnais Global Banking | | | | Details |
| CLH | Compania Logistica de Hidrocarburos S.A. Spain | | | | Details |
| Cliff-H | Cliff House | | | | Details |
| CLKG | caulking | | | | Details |
| CLMP | canvas-lined metal petal basket | | | | Details |
| cln(d)(g) | clean(ed)(ing) | | | | Details |
| ClO2 | chlorine dioxide, a powerful biocide that dissolves biomass cell walls It is nearly impossible for bacteria to develop immunity against ClO2 | | | | Details |
| Clov | clovery | | | | Details |
| clr | clear | | | | Details |
| clr | clear, clearance | | | | Details |
| CLR | cooler | | | | Details |
| CLR/TWR | cooling tower | | | | Details |
| CLRC | Career Ladder Review Committee | | | | Details |
| clrg | clearing | | | | Details |
| CLRP | Color Plot Continuous | | | | Details |
| clsd | closed | | | | Details |
| CLST | Clay Stone | | | | Details |
| CLT | Central Limit Theorem | | | | Details |
| CLTR | collector | | | | Details |
| cly | clay | | | | Details |
| Clyst | Claystone | | | | Details |
| clystn | clavstone | | | | Details |
| CML | Condition Monitoring Location | | | | Details |
| CML | Channelmaster | | | | Details |
| CML N | Channelmaster-Neutron | | | | Details |
| CMPL | Completion | | | | Details |
| CNDL | Compensated Neutron Density | | | | Details |
| CNL | Compensated Neutron Log | | | | Details |
| CNl | Compensated Neutron log Messung | | | | Details |
| CNL | Compensated Neutron Log. | | | | Details |
| CNL | compensated neutron log Radioactive neutron source bombards the formation with high energy neutrons, which are slowed and captured by atoms of the formation The low energy neutrons are reflected back to the tool and counted The amount of neutrons returning is inversely proportional to the porosity of the formation | | | | Details |
| CNLC | China National Logging Company | | | | Details |
| CNLFD | CNL/FDC Log | | | | Details |
| CNLOPB | Canada-Newfoundland and Labrador Offshore Petroleum Board | | | | Details |
| CNLP | Compensated Neutron Log Porosity | | | | Details |
| cntl | control(s) | | | | Details |
| Coal | sedimentary rock, often highly naturally fractured, composed of thermally modified plant remains | | | | Details |
| COBLDN | Closing Of Business LoDoN | | | | Details |
| COBOL | Common Business Oriented Language | | | | Details |
| COBOL | Common Business-Oriented Language | | | | Details |
| COL | Collar Log | | | | Details |
| COL | Cost Of Living | | | | Details |
| COL | COLOMBIA | | | | Details |
| COL | collar | | | | Details |
| COL | colored | | | | Details |
| COL | column | | | | Details |
| Col | ASTM Color American Standard Test Method | | | | Details |
| Cole | Jct Coleman Junction | | | | Details |
| coll | collect(ed)(ing)(ion) | | | | Details |
| Colloq | Colloquial (means informal) | | | | Details |
| COLPET | Colombian Petroleum Co. Colombia | | | | Details |
| colr | collar | | | | Details |
| Com AVL | Compensated Acoustic Velocity Log | | | | Details |
| Com AVL-G | Compensated Acoustic Velocity | | | | Details |
| Com AVL-N | Compensated Acoustic Velocity | | | | Details |
| COML | Compaction Log | | | | Details |
| coml | commercial | | | | Details |
| concl | conclusion | | | | Details |
| confl | conflict | | | | Details |
| congl | conglomerate (itic) | | | | Details |
| congl | conglomerate | | | | Details |
| CONL | Contact | | | | Details |
| consol | consolidated | | | | Details |
| CORL | Correlation | | | | Details |
| CORLG | Correlation Log | | | | Details |
| correl | correlation, correlated | | | | Details |
| correl | correlation | | | | Details |
| CPCL | Chennai Petroleum Corp. Ltd. India | | | | Details |
| CPEL | Corrosion And Protection Evaluation Log | | | | Details |
| CPL | Computed Porosity | | | | Details |
| cplg | coupling | | | | Details |
| CRDL | cradle(s) | | | | Details |
| CRL | Cost Recovery Limit | | | | Details |
| crs-xln | coarse crystalline | | | | Details |
| crypto-xln | cryptocrystalline | | | | Details |
| CS - Filter | Con-Slot Filter | | | | Details |
| CSL | county school lands | | | | Details |
| CSL | center section line | | | | Details |
| CTL | Coal-to-liquid conversion | | | | Details |
| CTL | coiled tubing logging | | | | Details |
| CTL | Cement Top Location | | | | Details |
| CTL | Scattered Gamma Ray | | | | Details |
| CTL | Cemotop | | | | Details |
| CTL | Time Lapse | | | | Details |
| CTLF | Coiled Tubing Lift Frame | | | | Details |
| CTLF | compensated tension lift frame | | | | Details |
| Ctlmn | Cattleman | | | | Details |
| culv | culvert | | | | Details |
| Cut Oil | cutting oil | | | | Details |
| Cut Oil Act | cutting oil active-sulfurized-dark | | | | Details |
| Cut Oil Act | cutting oil active-sulfurized-transparent | | | | Details |
| Cut Oil | cutting oil inactive-sulfurize | | | | Details |
| Cut Oil Sol | cutting oil soluble | | | | Details |
| Cut Oil St Mrl | cutting oil straight mineral | | | | Details |
| Cutl | Cutler | | | | Details |
| CWL | Cyberlook Wellsite Camp | | | | Details |
| CYBLK | Cyberlook Log | | | | Details |
| Cycl | cyclone | | | | Details |
| Cycl | canc. Cyclamina cancellata | | | | Details |
| cyl | cylinder | | | | Details |
| CYL | Cyberlock | | | | Details |
| CYLDT | Litho-Density Quicklook | | | | Details |
| CYPL | Production Logging Quicklook | | | | Details |
| CZDL | Compensated Z-Densilog | | | | Details |
| D/L | density log | | | | Details |
| DAL | Digital Acoustilog | | | | Details |
| Dbl | Double | | | | Details |
| DBL SKIN | DouBLe SKINned | | | | Details |
| DCAL | Differential Caliper Log | | | | Details |
| DCAL | dual caliper log | | | | Details |
| DCALI | Dual Caliper Log | | | | Details |
| DCL | Dielectric Constant Log | | | | Details |
| DCLSP | digging slush pits | | | | Details |
| DDL | Daily Drilling Log | | | | Details |
| DDL | Dual Detector Log | | | | Details |
| DDNL | Dual Det. Neutron Life Log | | | | Details |
| decl | decline | | | | Details |
| defl | deflection | | | | Details |
| Del R | Del Rio | | | | Details |
| DEL2 | Dielectric Log - 200 Mhz | | | | Details |
| DEL2 | Dielectric Log- 200 MHz | | | | Details |
| DEL4 | Dielectric Log - 47 Mhz | | | | Details |
| DEL4 | Dielectric Log – 47 MHz | | | | Details |
| Dela | Delaware | | | | Details |
| DELEK | Delek the Israel Fuel Corp. Ltd. Israel | | | | Details |
| DELTA | Delta- Tlog | | | | Details |
| delv | delivery(ed)(ability) | | | | Details |
| delv | pt delivery point | | | | Details |
| DELY | DELiverY | | | | Details |
| DENL | Density | | | | Details |
| DENL | Density Log | | | | Details |
| depl | depletion | | | | Details |
| desalt | deslater | | | | Details |
| DESFL | Deep Induction SFL Log | | | | Details |
| desulf | desulfurizer | | | | Details |
| devel | develop (ed) (ment) | | | | Details |
| devel | develop(ed)(ment) | | | | Details |
| DEVLG | Deviation Log | | | | Details |
| DGLV | dummy gas lift valve | | | | Details |
| DGTL | digital | | | | Details |
| DIAL | Differential Absorption Light Detection and Ranging | | | | Details |
| DIAL | Dia-Log | | | | Details |
| dichlor | dichloride | | | | Details |
| DICOL | Distribuidora de Combustiveis e Lubrificantes da Guinea Bissau Lda. Portugal | | | | Details |
| DIEL | Dielectric Log | | | | Details |
| diethyl | diethylene | | | | Details |
| DIFL | Dual Induction Focused Log | | | | Details |
| DIFL | dual injection focus log | | | | Details |
| DIFL | Dual Induction-Focused Log | | | | Details |
| DIFL/GR | Dual Induction Focused Log Gamma Ray | | | | Details |
| DIGL | Dual Induction Gamma Log | | | | Details |
| DIL | Dual Induction Log | | | | Details |
| DIL | Dual Induction Laterolog | | | | Details |
| DIL | Dual Induction-Laterologging | | | | Details |
| DIL | Dual Induction SFL Log | | | | Details |
| DIL | Dual Induction Dual Induction Log | | | | Details |
| DILB | Dual Induction BHC Log | | | | Details |
| DILL | Dual Induction Laterolog | | | | Details |
| DILL | Dual Induction Lateral/Dual Induction Focus | | | | Details |
| DILL | Dual Induction Lateral | | | | Details |
| DILLS | Dual Induction Log-LLS | | | | Details |
| DILSL | Dual Induction Log-SLS | | | | Details |
| dilut | diluted | | | | Details |
| DIPLP | Dip Lithology Pressure Log | | | | Details |
| DISFL | DISFL DBHC Gamma Ray Log | | | | Details |
| displ | displaced, displacement | | | | Details |
| DL | Development Licence (United Kingdom), a type of onshore licence issued before 1996 | | | | Details |
| DL | Differential Liberation | | | | Details |
| DL | Drillers Log | | | | Details |
| dl | deciliter | | | | Details |
| DL | drilling line | | | | Details |
| DLA | Development Lease Area | | | | Details |
| DLC | dual lower tubing | | | | Details |
| DLE | Differential Liberation Equation (see comment - type of PVT analysis) | | | | Details |
| DLIST | Dip List Log | | | | Details |
| DLL | Dual Laterolog | | | | Details |
| DLL | Dynamic Link Library | | | | Details |
| DLL | Dual Laterolog (Simultaneous) | | | | Details |
| DLL | detection level limited | | | | Details |
| DLL | Dual Laterlog | | | | Details |
| DLL/MSFL | Dual Laterolog/Microspherically Focused | | | | Details |
| DLLT | Dual Laterolog | | | | Details |
| DLOSP | Dropping Last Outwards Sea Pilot (Norway) | | | | Details |
| dlr | dealer | | | | Details |
| DLS | Dog-Leg Severity (directional drilling) | | | | Details |
| DLS | Dog Leg Severity | | | | Details |
| DLS | dogleg severity | | | | Details |
| DLT | Dual Laterolog | | | | Details |
| DLT | A kind of hydraulic set packer from Weatherford | | | | Details |
| DLT | dual lower tubing | | | | Details |
| DMGL | Digital Magneline | | | | Details |
| dml | demolition | | | | Details |
| DNL | dual porosity CNL | | | | Details |
| DNL | Dual-Energy Neutron Log | | | | Details |
| DNL | Dual Porosity Compensated Neutron | | | | Details |
| DOBLDG | dock operating building | | | | Details |
| DOL | Dolomite | | | | Details |
| dolo | dolomite | | | | Details |
| dolo | dolomite(ic) | | | | Details |
| DOLSP | Dropping Off Last Sea Pilot ( Norway) | | | | Details |
| dolst | dolstone | | | | Details |
| DPIL | Dual Phase Induction Log | | | | Details |
| DPL | Dual Propagation Log | | | | Details |
| DPL | Drill Pipe Electric Log | | | | Details |
| DPL | Deep Propagation Log | | | | Details |
| DPLD | Differential Pressure Levitated Device (or Vehicle) | | | | Details |
| DQLC | Dipmeter Quality Control Log | | | | Details |
| DRGL | drilling | | | | Details |
| DRL | Drilling Run | | | | Details |
| DRL | double random lengths | | | | Details |
| drl | drill | | | | Details |
| DRLCT | Drilling Chart | | | | Details |
| drld | drilled | | | | Details |
| drlg | drilling | | | | Details |
| DRLOG | Drilling Log | | | | Details |
| DRLPR | Drilling Proposal/Prog. Report | | | | Details |
| drlr | driller | | | | Details |
| DSL | Digital Slick Line (new slick line by SLB can be used insteade of W/L) | | | | Details |
| DSL | diesel | | | | Details |
| DSL | Dual Spacing Log | | | | Details |
| dsl | diesel(oil) | | | | Details |
| DSL | Dig ital Spectralog | | | | Details |
| DSLT | Digitizing Sonic Logging | | | | Details |
| DSTL | Drill Stem Test Log | | | | Details |
| dstl | distillate | | | | Details |
| DtL | Drilling The Limit | | | | Details |
| Dubal | Dubai Aluminium Company | | | | Details |
| dull | dull | | | | Details |
| DVL | develop | | | | Details |
| DVL1 | Digital Vertiline 4-1/2 in. (114mm) | | | | Details |
| DVL2 | Digital Vertiline 5-1/2 in. (140mm) | | | | Details |
| DVL3 | Digital Vertiline 7 in. (178mm) | | | | Details |
| DVL4 | Digital Vertiline 8-5/8 8 on. (219mm) | | | | Details |
| DVTL | Digital Vertiline | | | | Details |
| DWLA | DST LINC* WireLine Adapter (* mark of SLB ) - UPP versatility | | | | Details |
| DWLTI | Days Without Lost Time Injury | | | | Details |
| DWQL | Dual Water Quicklook Log | | | | Details |
| E of W/L | east of west line | | | | Details |
| E/BL | east boundary line | | | | Details |
| E/L | east line | | | | Details |
| E’ly | easterly | | | | Details |
| Earls | Earlsboro | | | | Details |
| ECATWW-L | Wireline department in GAE | | | | Details |
| ECL | Eclipse | | | | Details |
| ECOPETROL | Empresa Colombiana de Petroleos Colombia | | | | Details |
| Ed lm | Edwards lime | | | | Details |
| EEPAL | Exxon Exploration and Production Azerbaijan Limited | | | | Details |
| effl | effluent | | | | Details |
| EFL | Electrical Flying Lead | | | | Details |
| Egl | Eagle | | | | Details |
| EGLV | Electric Gas Lift Valve | | | | Details |
| Eglwd | Englewood | | | | Details |
| EgyptAlum | Egypt Aluminium | | | | Details |
| EIVAL | Sociedad de Empreendimentos, Investimentos e Armazenagem de Gases S.A. Portugual | | | | Details |
| EL | Electric Log | | | | Details |
| EL | Effluent Line | | | | Details |
| EL | elevation | | | | Details |
| EL | elevation(height) | | | | Details |
| EL | Electrolog | | | | Details |
| el gr | elevation ground | | | | Details |
| EL&P | exploration, land and production | | | | Details |
| EL/T | electronic log tops | | | | Details |
| ELAN | Elemental Analysis program (SLB) | | | | Details |
| Elb | Elbert | | | | Details |
| ELB | elbow | | | | Details |
| ELC | Europe Learning Center (Schlumberger's base in France) | | | | Details |
| elec | electric(al) | | | | Details |
| Elec/MAG | electromagnetic | | | | Details |
| elem | element, elementary | | | | Details |
| elev | elevation, elevator | | | | Details |
| ELF | Elf Aquitaine (now TotalFinaElf ) France | | | | Details |
| ELF | NORGE Elf Petroleum Norge A/S Norway | | | | Details |
| ELG | effluent limitation guidelines | | | | Details |
| Elg | Elgin | | | | Details |
| ELGI | Eotvos Lorand Geofizikai Intezet (Geophysical Institute of Hungary) Hungary | | | | Details |
| ELIM | eliminate(tor)(ed) | | | | Details |
| ell(s) | elbow(s) | | | | Details |
| Ellen | Ellenburger | | | | Details |
| Elm | Elmont | | | | Details |
| ELMD | electric line measured depth | | | | Details |
| ELMF | Enhanced Liquid Measurement Flowmeter | | | | Details |
| ELNG | Egypt LNG | | | | Details |
| ELS | Überspülrohr mit Upset | | | | Details |
| ELT | Economic Limit Test | | | | Details |
| ELT | Electric log tops | | | | Details |
| EMALCO | Empresa Almacenadora de Combustibles Ltda. Chile | | | | Details |
| EMBL | Emirates Merchant Bank Ltd. | | | | Details |
| empl | employee | | | | Details |
| emul | emulsion | | | | Details |
| ENACOL | Empresa Nacionale de Combustiveis, SARL Cape Verde | | | | Details |
| encl | enclosure | | | | Details |
| enl | enlarged | | | | Details |
| enml | enamel | | | | Details |
| ENTELEC | Energy Telecommunications & Electrical Association | | | | Details |
| EOFL | End of Field Life | | | | Details |
| EOL | end of line | | | | Details |
| EPL | EPL Log | | | | Details |
| EPLF | E&P Leadership Forum | | | | Details |
| EPLG | Epilog | | | | Details |
| EPLPC | EPL-PCD-SGR Log | | | | Details |
| EPLT | E&P Leadership Team | | | | Details |
| ES-ULS | Salt Dome Profiling | | | | Details |
| et al | and others | | | | Details |
| etal | et al. (and others) | | | | Details |
| ethyle | ethylene | | | | Details |
| eval | evaluate | | | | Details |
| EXCL | EXCLusive | | | | Details |
| excl | excellent | | | | Details |
| EXL | or XL, Exploration Licence (United Kingdom), a type of onshore licence issued between the First Onshore Licensing Round (19 6) and the Sixth (1992) | | | | Details |
| expl | exploratory, exploration | | | | Details |
| explos | explosive | | | | Details |
| F & L | fuels & lubricants | | | | Details |
| FACIL | facility(ies) | | | | Details |
| fail | failure | | | | Details |
| FAL | Analysis Formation | | | | Details |
| FAL | Formation Analysis | | | | Details |
| FAL | Rwa Logging | | | | Details |
| Fall | Riv Fall River | | | | Details |
| FANAL | Formation Analysis Sheet Log | | | | Details |
| Fault | where rock splits or ruptures with associated movement occurs on either side | | | | Details |
| FCAL | Single Axis Caliper | | | | Details |
| FCL | facility capacity limits | | | | Details |
| FCOL | Fluid Coloration (see comment!) | | | | Details |
| FDCNL | formation density compensated neutron log | | | | Details |
| FDL | formation density log | | | | Details |
| FE/L | from east line | | | | Details |
| FEL | Front End Loading (AFEs & Projects) | | | | Details |
| fel | from east line | | | | Details |
| FELA | Federal Employers Liability Act | | | | Details |
| Fertil | Ruwais Fertilizer Industries | | | | Details |
| FERTIL | Ruwais Fertilizer Industries Ltd. Abu Dhabi | | | | Details |
| FFL | final fluid level | | | | Details |
| FGEOL | Final Geological Report | | | | Details |
| FGLR | formation GLR | | | | Details |
| FIL | FIL Log | | | | Details |
| FIL | Sidewall Frac Log | | | | Details |
| FIL | Fracture Identification Log | | | | Details |
| filt | filtrate | | | | Details |
| fisl | fissile | | | | Details |
| FL | Fluid Loss | | | | Details |
| FL | Flying Lead (Subsea kit) | | | | Details |
| FL | F Log | | | | Details |
| FL | FLow Line | | | | Details |
| Fl | Financial | | | | Details |
| FL | Florida | | | | Details |
| FL | fluid level | | | | Details |
| FL | flashing | | | | Details |
| FL | floor | | | | Details |
| fl | fluid | | | | Details |
| FL | flush | | | | Details |
| fl/ | flowed(ing) | | | | Details |
| FL/BD | flammable liquid building | | | | Details |
| FLA | Four Letter Acronyms | | | | Details |
| FLA | Ferry Lake anhydrite | | | | Details |
| FLAP | fluid level above pump | | | | Details |
| flat | flattened | | | | Details |
| Flath | Flathead | | | | Details |
| FLC | Fluid Loss Control | | | | Details |
| Fl-COC | flash point, Cleveland Open Cup | | | | Details |
| FLD | Fluid Loss Device (Completion valve) | | | | Details |
| fld | failed | | | | Details |
| fld | feldspar(thic) | | | | Details |
| fld | field | | | | Details |
| FLD | full-length drift | | | | Details |
| fldspr | feldspar | | | | Details |
| FLE | FLE time (Finland, Lithuania, Estonia) UTC+2 or +3 summertime (EEC: Eastern European Time) | | | | Details |
| FLET | Flowline End Termination (AKA PLET) | | | | Details |
| flex | flexible | | | | Details |
| flg | flowing | | | | Details |
| flg(d)(s) | flange(ed)(es) | | | | Details |
| Flip | Flippen | | | | Details |
| FLIV | FlowLine Injection Valve | | | | Details |
| FLIV | Flowline Isolation Valve | | | | Details |
| FLK | FALKLAND ISLANDS (MALVINAS) | | | | Details |
| flk | flaky | | | | Details |
| FLMB | flammable | | | | Details |
| FLN | Front de Libération Nationale | | | | Details |
| FLNG | Floating Liquid Natural Gas | | | | Details |
| FLO | Flow Meter | | | | Details |
| FLO | Fluid Travel | | | | Details |
| FLO | Nuclear Flow | | | | Details |
| FLO | Subsurface Injector | | | | Details |
| FLO | Flo Meter | | | | Details |
| flo | flow | | | | Details |
| FLO | flushing oil | | | | Details |
| FLO | Flowmeter | | | | Details |
| FLOG | FLOG PHIX RHGX Log | | | | Details |
| FLOPR | Flow Profile Report | | | | Details |
| Flor | fl Florence flint | | | | Details |
| FLOT | Flying Lead Orientation Tool | | | | Details |
| FLOW | Flow & Buildup Test Report | | | | Details |
| FLRA | Field Level Risk Assessment | | | | Details |
| FLS | Fluid Sample | | | | Details |
| flshd | flushed | | | | Details |
| FLSO | Liquefaction Storage and Offloading (vessel) | | | | Details |
| flt | Fault (geology) | | | | Details |
| Flt | fault | | | | Details |
| flt | float | | | | Details |
| fltg | floating | | | | Details |
| fltn | flotation | | | | Details |
| FLTR | Fluid Travel Log/Fluid Entry Survey | | | | Details |
| FLTR | filter | | | | Details |
| flu | fluorescence | | | | Details |
| flu | flouresence | | | | Details |
| flu | flue | | | | Details |
| Flu | fluid | | | | Details |
| fluor | fluorescence, fluorescent | | | | Details |
| FLUORAZ | a high performance elastomer for seal assemblies | | | | Details |
| FLUP | Fill Up Production Valve | | | | Details |
| flw(d)(g) | flow(ed)(ing) | | | | Details |
| Flwg | Pr. flowing pressure | | | | Details |
| Flwrpt | flowerpot | | | | Details |
| FLXBX | flexibox | | | | Details |
| FLXP | FlexPac retrievable packer | | | | Details |
| FNEL | from northeast line | | | | Details |
| fnl | from north line | | | | Details |
| fnly | finely | | | | Details |
| FNWL | from northwest line | | | | Details |
| FOCL | Focus | | | | Details |
| FOCL | focused log | | | | Details |
| Fol | foliated | | | | Details |
| FPL | Flow Analysis Log | | | | Details |
| FPLAN | Field Plan Log | | | | Details |
| FRAC L | Frac Log | | | | Details |
| FRXL | Forxo | | | | Details |
| FS&WLs | from south and west lines | | | | Details |
| FSEL | from southeast line | | | | Details |
| fsl | from south line | | | | Details |
| FSWL | from southwest line | | | | Details |
| FTL | Fluid Transfer Line | | | | Details |
| ft-lb | foot-pound | | | | Details |
| ft-lb/hr | foot-pound per hour | | | | Details |
| FTrL | Fluid Travel Log | | | | Details |
| FULDI | Full Diameter Study Report | | | | Details |
| Full | Fullerton | | | | Details |
| Fussel | Fusselman | | | | Details |
| Fusul | Fusulinid | | | | Details |
| FWL | Free water level | | | | Details |
| fwl | from west line | | | | Details |
| FY LE | Full Year Latest Estimate | | | | Details |
| FYLE | Full Year Latest Estimate | | | | Details |
| G/L | Gain/Loss | | | | Details |
| G/L | gathering line | | | | Details |
| GAIL | Gas Authority of India Ltd. | | | | Details |
| GAIL | Gail (India) Limited | | | | Details |
| GAIL | Gas Authority India | | | | Details |
| gal | gallon(s) | | | | Details |
| gal | sol gallons of solution | | | | Details |
| gal/day | gallons per day | | | | Details |
| gal/Mcf | gallons per thousand cubic feet | | | | Details |
| gal/min | gallons per minute | | | | Details |
| gal/yr | gallons per year | | | | Details |
| Gall | Gallatin | | | | Details |
| GALUK | Gallon (UK) | | | | Details |
| galv | galvanized | | | | Details |
| GATOIL | Subsidiary of NOC Libya Libya | | | | Details |
| Gcal | gigacalorie | | | | Details |
| g-cal | gram calorie | | | | Details |
| GCLO | gas cut load oil | | | | Details |
| GCLO | gas-cut load oil | | | | Details |
| GCLOG | Graphic Core Log | | | | Details |
| GCLW | gas cut load water | | | | Details |
| GCLW | gas-cut load water | | | | Details |
| GD li | Glen Dean lime | | | | Details |
| Gdld | Goodland | | | | Details |
| gel | gelled | | | | Details |
| gel | jelly-like colloidal suspension | | | | Details |
| genl | general | | | | Details |
| GEOL | Geological Surveillance Log | | | | Details |
| Geol | geologist | | | | Details |
| geol | geology(ist)(ical) | | | | Details |
| GEOPLIN | Slovenian Gas Company Slovenia | | | | Details |
| GFLU | good fluorescence | | | | Details |
| GGL | Gamma Gamma Log | | | | Details |
| gil | gilsonite, gilsonitic | | | | Details |
| gil | gilsonite | | | | Details |
| Gilc | Gilcrease | | | | Details |
| GL | Gas Lift | | | | Details |
| GL | Ground Level | | | | Details |
| GL | Germanischer Lloyd | | | | Details |
| GL | GREENLAND | | | | Details |
| GL | Gaslift | | | | Details |
| Gl | gas injection | | | | Details |
| GLADTM | software package, gas lift assisted design | | | | Details |
| glau | glauconite, glauconitic | | | | Details |
| glauc | glauconitic | | | | Details |
| GLBVV | globe valve | | | | Details |
| gld | thd galled threads | | | | Details |
| GLE | Ground Level Elevation (generally in metres above mean sea level) | | | | Details |
| Glen | Glenwood | | | | Details |
| GLESS | GearLESS | | | | Details |
| GLI | Generalized Linear Inversion | | | | Details |
| GLM | Gas Lift Mandrel (alternative name for Side Pocket Mandrel) | | | | Details |
| GLM | Gas Lift Mandrels | | | | Details |
| GLM | gas lift mandrel | | | | Details |
| glna | Galena | | | | Details |
| GLO | gas lift oil | | | | Details |
| GLO | General Land Office(Texas) | | | | Details |
| Glob | Globigerina | | | | Details |
| Glor | Glorieta | | | | Details |
| GLP | GUADELOUPE | | | | Details |
| GLR | Gas Liquid Ratio | | | | Details |
| GLR | gas / liquid ratio | | | | Details |
| GLR | gas-liquid ratio | | | | Details |
| gls(y) | glass, glassy | | | | Details |
| GLT | GLT Log | | | | Details |
| GLT | gas lift transfer | | | | Details |
| GLV | Gas Lift Valve | | | | Details |
| GlV | Gasliftventil | | | | Details |
| GlW | Gasliftwechsel | | | | Details |
| glyc | glycol | | | | Details |
| gm-cal | gram-calorie | | | | Details |
| GMWL | Global Meteoric Water Line | | | | Details |
| Gol | Golconda lime | | | | Details |
| Gouldb | Gouldbusk | | | | Details |
| GPL | Gujarat Pipavav Port Ltd. | | | | Details |
| GPL | Gas Petroleum Liquids | | | | Details |
| GPLT | Geol Plot Log | | | | Details |
| GPSL | Geo Pressure Log | | | | Details |
| GR/CALD | Gamma Ray/Dual Caliper | | | | Details |
| GR/D CALIPER | Gamma Ray/Dual Caliper | | | | Details |
| GRDL | Guard | | | | Details |
| GRDL | guard log | | | | Details |
| GRL | GREENLAND | | | | Details |
| GRL | Gallllla Ray | | | | Details |
| GRLOG | Grapholog | | | | Details |
| GRNL | Gamma Ray - Neutron | | | | Details |
| GRNL | Gamma Ray – Neutron | | | | Details |
| grnlr | granular | | | | Details |
| GRSL | Gamma Ray - Sonic | | | | Details |
| GRSL | Gamma Ray – Sonic | | | | Details |
| GSLIB | Geostatistical Software Library | | | | Details |
| GTL | Gas-to-liquids conversion | | | | Details |
| GTL | gas to liquids | | | | Details |
| gvl | gravel | | | | Details |
| GVLPK | gravel packet | | | | Details |
| HAL | Halite | | | | Details |
| HAL | HALLIBURTON LOG SERVICE | | | | Details |
| HALS | High Resolution Azimuthal Laterlog Sonde | | | | Details |
| HALS | High Resolution Array Lithology Sonde. | | | | Details |
| HCAL | HRCC Calliper (in Logs)(in Inches) | | | | Details |
| HCl | see hydrochloric acid | | | | Details |
| HCl | hydrogen chloride | | | | Details |
| HClO2 | chlorine dioxide, a bacteria killer | | | | Details |
| HCLS | Heave Compensating Lift/Landing System (for subsea tree deployment) | | | | Details |
| Hd li | hard lime | | | | Details |
| HDIL_BA | High-Definition Induction Log | | | | Details |
| HDIL_HAL | Hostile Dual Induction | | | | Details |
| hdl | handle | | | | Details |
| HDLL | High-Definition Lateral Log | | | | Details |
| HDLTSBENDS | Half Despatch Lay Time Saved Both Ends | | | | Details |
| HDS1L | High-Speed Directional Survey | | | | Details |
| Heel | the area of pay closest to the casing in a highly deviated well | | | | Details |
| HEL | Hosteil Environment Logging | | | | Details |
| HELDK | HELicopter DecK | | | | Details |
| HELIOS | Ste. Pour la Construction et l’Exploitation d’une Usine d’Helium Liquide et d’Azote Algeria | | | | Details |
| HFL | Hydraulic Flying Lead | | | | Details |
| Hill | Hilliard | | | | Details |
| HILT | High Integrated Logging Tool | | | | Details |
| HISPANOIL | Hispanica de Petroleos, S.A. (see Repsol) Spain | | | | Details |
| HKL | HookLoad (German: Haken Last) | | | | Details |
| HL | Hook Load | | | | Details |
| HL | Hohlladung (perforation charges) | | | | Details |
| HL | Hubbert Linearization | | | | Details |
| HL | Hohlladung | An old type of perforation charges.. | | | Details |
| HLDN | hold down | | | | Details |
| HLDS | Hostile Litho-Density Sonde | | | | Details |
| HLDT | Hostile Environment Litho-Density | | | | Details |
| HLN | hydraulic landing nipple | | | | Details |
| HLO | Heavy Load-out (Facility) | | | | Details |
| HLO | Helicopter Landing Officer | | | | Details |
| HLO | Helicopter Landing Officer (jobrole/trainingcourse) | | | | Details |
| HLS | Layer/Square | | | | Details |
| HLSD | high-level shutdown | | | | Details |
| HND/WHL | handwheel | | | | Details |
| HNDLG | handling | | | | Details |
| holiday | Hole in the protective coating of a steel pipeline in the field | | | | Details |
| Holl | Hollandberg | | | | Details |
| HPCL | Hindustan Petroleum Corporation Limited | | | | Details |
| HPCL | Hindustan Petroleum Corporation Ltd. India | | | | Details |
| HPLT | high pressure, low temperature Identification of the problem zone for hydrate formation | | | | Details |
| HRAL | High resolution Array Laterolog | | | | Details |
| HRLA | High-Resolution Laterolog Array Tool | | | | Details |
| HRLT | High-Resolution Laterolog Array Tool | | | | Details |
| HS CBL | H2S Cable | | | | Details |
| H-SEL | perforating hyper select | | | | Details |
| HSLT | HPHT Digital Sonic Logging Tool (aka XSLT) | | | | Details |
| HSLT | HPHT Digial Sonic Logging Tool (aka XSLT) | | | | Details |
| HTML | Hyper Text Markup Language | | | | Details |
| HVFL | HeaVy Fuel | | | | Details |
| HVL | high volume lift | | | | Details |
| hvly | heavily | | | | Details |
| H-VOLT | high voltage | | | | Details |
| HYDL | Hydrologsm | | | | Details |
| HYLSA | Hojalata y Lamina, S.A. Mexico | | | | Details |
| IATEFL | International Association of Teachers of English as Foreign Language | | | | Details |
| ICAL | Imaging Caliper | | | | Details |
| IDEL | IDEL Log | | | | Details |
| IDLH | Immediately Dangerous to Life & Health | | | | Details |
| IEL | Induction Electrical Log | | | | Details |
| IEL | Induction Electrolog | | | | Details |
| IEL | Induction Electric Log | | | | Details |
| IEL | Induction Log | | | | Details |
| IEL | Induction Electric | | | | Details |
| I-EL | Induction-Electric Log | | | | Details |
| IEL/GR | Induction Electrolog Gamma Ray | | | | Details |
| IEL/GR | Induction Log-Gamma Ray | | | | Details |
| IEL/GR/NEU | Induction Electrolog Gamma | | | | Details |
| IEL/NEU | Induction Electrolog Neutron | | | | Details |
| IEL/NEU | Induction Log-Neutron | | | | Details |
| IEL-G | Induction Electric Gamma Ray | | | | Details |
| IEL-GR | Induction Electrolog-Gamma Ray | | | | Details |
| IEL-GRN | Induction Electrolog-Gamma Ray Neutron | | | | Details |
| IEL-N | Induction Electric Neutron | | | | Details |
| IEL-N | Induction Electrolog-Neutron | | | | Details |
| i-Field | Intelligent Field | | | | Details |
| IFL | initial fluid level | | | | Details |
| IGLR | injection gas lift ratio | | | | Details |
| IHLS | Independent High Level Switch | | | | Details |
| IIL | Dual Induction - Electric | | | | Details |
| IJL | Injection Log | | | | Details |
| IL | Induction Log | | | | Details |
| IL | ICELAND | | | | Details |
| IL | ISRAEL | | | | Details |
| IL | Illinois | | | | Details |
| IL | Induction | | | | Details |
| ILC | Independent Learning Center (PI) | | | | Details |
| ILD | Deep Indection Log | | | | Details |
| ILI | InLine Inspection (Intelligent Pigging) | | | | Details |
| ILL | Induction - Lateral | | | | Details |
| ILL | Induction-Lateral | | | | Details |
| I-LL | Induction-Laterolog | | | | Details |
| ILM | Medium Indection Log | | | | Details |
| ILMA | Independent Lubricant Manufacturers Association | | | | Details |
| ILO | International Labour Organization | | | | Details |
| ILOGS | Image Logs | | | | Details |
| ILSA | Iran-Libya Sanctions Act | | | | Details |
| ILTA | Independent Liquid Terminals Association | | | | Details |
| ILUM | illuminator(s) | | | | Details |
| in.-lb | inch-pound | | | | Details |
| incl | inclusions | | | | Details |
| INCL | Inclination | | | | Details |
| incl | include(ed)(ing) | | | | Details |
| INCLR | intercooler | | | | Details |
| incls | inclusions | | | | Details |
| Inl | inland | | | | Details |
| Inl | inlet | | | | Details |
| Inlam | interlaminated | | | | Details |
| insole | insoluble | | | | Details |
| inst(d)(g)(l) | install(ed)(ing)(tion) | | | | Details |
| insul | insulate | | | | Details |
| intclr | intercooler | | | | Details |
| interlam | inter laminated | | | | Details |
| inter-lam | interlaminated | | | | Details |
| inter-xln | intercrystalline | | | | Details |
| interxlyn | intercrystalline | | | | Details |
| INTL | internal | | | | Details |
| intl | interstitial | | | | Details |
| IOL | International Octane Ltd. | | | | Details |
| IPL | Integrated Porosity Lithology | | | | Details |
| IPL | integrated porosity logging | | | | Details |
| IPL | initial potential artificial Lift | | | | Details |
| IPL | initial production plunger lift | | | | Details |
| IPLS | IPLS Log | | | | Details |
| IPP/L | Interprovincial Pipe Line Co. | | | | Details |
| IRL | IRELAND | | | | Details |
| ISFL | ISF-LSS Log | | | | Details |
| ISFL ISF | SS Log | | | | Details |
| ISFLISF | LSS Log | | | | Details |
| ISFSL | ISF SLS MSFL Log | | | | Details |
| ISL | ICELAND | | | | Details |
| ISOL | Isotron | | | | Details |
| ISOL | isolate(tor) | | | | Details |
| IWL | Institute Warranty Limits | | | | Details |
| JDL | Jar Down pulling tool for L Core option | | | | Details |
| KALREZTM | a brand name for a high temperature seal | | | | Details |
| Kbbl/d | 1000 barrels per day | | | | Details |
| kcal | kilocalorie | | | | Details |
| KCl | potassium chloride salt | | | | Details |
| KDB-LDG | FLG kelly drill bushing to landing flange | | | | Details |
| KDB-MLW | kelly drill bushing to mean low water | | | | Details |
| KDB-Plat | kelly drill bushing to platform | | | | Details |
| KEVLARTM | an extremely strong fiber, common in composites | | | | Details |
| kg-cal | kilogram-calorie | | | | Details |
| Kilo | kilogram, 1000 grams | | | | Details |
| KL | Kill Line | | | | Details |
| KL | Klinkenberg corrected gas permeability | | | | Details |
| kl | kiloliter | | | | Details |
| Kl/d | 1000 liters per day | | | | Details |
| kld | killed | | | | Details |
| K-Line | Kawasaki Kishen Kaisha | | | | Details |
| Kl-Packer | Klappen-Packer | | | | Details |
| KOLNG | Korea LNG Company | | | | Details |
| ktle | kettle | | | | Details |
| L & P | ladder & platform | | | | Details |
| L U | lease use(gas) | | | | Details |
| L x R | links rechts Übergang | | | | Details |
| L&T | Larsen and Toubro | | | | Details |
| L.P. | line pipe | | | | Details |
| L.S. | LumpSum. | | | | Details |
| L.T. | Liner Terms | | | | Details |
| L/ | Lower, i.e., L/Gallup | | | | Details |
| L/Alb | Lower Albany | | | | Details |
| L/Cret | Lower Cretaceous | | | | Details |
| L/D | Laydown (at rigsite) | | | | Details |
| L/D | Lay Down (ablegen) | | | | Details |
| L/Tus | Lower Tuscaloosa | | | | Details |
| LA | LAOS | | | | Details |
| lA | Iowa | | | | Details |
| LA | Louisiana | | | | Details |
| LA | level alarm | | | | Details |
| LA | lightning arrester | | | | Details |
| LA | load acid | | | | Details |
| La | Mte La Motte | | | | Details |
| lab | labor | | | | Details |
| lab | laboratory | | | | Details |
| LACT | Lease Automatic Custody Transfer | | | | Details |
| LACT | lease automatic custody transfer unit A calibrated measurement device used as an official sales point for crude oil transfer into a second party pipeline | | | | Details |
| LAD | Logging After Drilling | | | | Details |
| lad | ladder | | | | Details |
| LAER | Lowest Achievable Emission Rate | | | | Details |
| LAFB | Libyan Arab Foreign Bank | | | | Details |
| LAG | lagging | | | | Details |
| LAH | Lookahead | | | | Details |
| LAIC | Libyan Arab Investment Company | | | | Details |
| Lak | Lakota | | | | Details |
| lam | laminated. laminations | | | | Details |
| lam | laminated, lamination(s) | | | | Details |
| LAN | local area network | | | | Details |
| Land | Landulina | | | | Details |
| Lans | Lansing | | | | Details |
| LAO | LAOS | | | | Details |
| LAOT | Linear Activation Override Tool | | | | Details |
| Lapco | Lavan Petroleum Company | | | | Details |
| Lar | Laramie | | | | Details |
| LARS | Launch & Recovery System | | | | Details |
| LAS | lower anhydrite stringer | | | | Details |
| LASH | Light Aboard SHip | | | | Details |
| LASMO | LASMO plc (London & Scottish Marine Oil Co.) UK | | | | Details |
| LASR | Laser Log | | | | Details |
| LAT | Lowest Astronomical Tide | | | | Details |
| LAT | LATitude | | | | Details |
| LATL | Lateral | | | | Details |
| Laud | Lauders | | | | Details |
| LAUF | lost and unaccounted for gas | | | | Details |
| LAYCAN | LAYday CANcelling date | | | | Details |
| LAYR | Multi-Layer Testing | | | | Details |
| Layt | Layton | | | | Details |
| LB | LEBANON | | | | Details |
| lb | pounds | | | | Details |
| LB | light barrel | | | | Details |
| lb | pound | | | | Details |
| LB | LaBomba 1060 | | | | Details |
| lb/ft | pounds per foot | | | | Details |
| lb/ft3 | pounds per cubic foot | | | | Details |
| lb/hr | pounds per hour | | | | Details |
| lb/sq | ft pounds per square foot | | | | Details |
| lb/ton | coke burn-off | | | | Details |
| lb/yr | pounds per year | | | | Details |
| LB10 | LaBomba 1370 | | | | Details |
| LB11 | LaBomba 1375 | | | | Details |
| LB13 | LaBomba 1459 | | | | Details |
| LB2 | LaBomba 1062 | | | | Details |
| LB3 | LaBomba 1081 | | | | Details |
| LB4 | LaBomba 1082 | | | | Details |
| LB5 | LaBomba 1083 | | | | Details |
| LB6 | LaBomba 1184 | | | | Details |
| LB7 | LaBomba 1365 | | | | Details |
| LB8 | LaBomba 1447 | | | | Details |
| LB9 | LaBomba 1369 | | | | Details |
| lb-in. | pound-inch | | | | Details |
| LBN | LEBANON | | | | Details |
| LBOS | light brown oil stain | | | | Details |
| LBR | LIBERIA | | | | Details |
| lbr | lumber | | | | Details |
| lbs | pounds | | | | Details |
| LBY | LIBYA | | | | Details |
| LC | Low Case | | | | Details |
| LC | Lower Completion | | | | Details |
| LC | Level Controller | | | | Details |
| LC | Loading Capacity | | | | Details |
| LC | LostCone | | | | Details |
| LC | Letter of Credit | | | | Details |
| LC | SAINT LUCIA | | | | Details |
| LC | lease crude | | | | Details |
| LC | long coupling | | | | Details |
| LC | lost circulation | | | | Details |
| LC | lower casing | | | | Details |
| LC | lug cover type(5-gallon can) | | | | Details |
| LCA | SAINT LUCIA | | | | Details |
| LCA | leakoff control acid | | | | Details |
| LCA | life-cycle assessment | | | | Details |
| LCC | Lowest Closed Contour (it is a contour line which is just above the spill point) | | | | Details |
| LCC | Life Cycle Cost | | | | Details |
| LCC | Lambert Conformal Conic | | | | Details |
| LCF | Latest Cost Factor | | | | Details |
| LCGO | light coker gas oil | | | | Details |
| lchd | leached | | | | Details |
| LCL | less-than carload lot | | | | Details |
| LCL | local | | | | Details |
| LCM | Lost Circulation Material | | | | Details |
| LCNLG | LDT CNL Gamma Ray Log | | | | Details |
| LCOE | levelized cost of electricity | | | | Details |
| LCP | leakage in closed position | | | | Details |
| LCP | local control panel | | | | Details |
| LCP | lug cover with pour spout | | | | Details |
| LCR | Lowest Current Rate | | | | Details |
| LCTD | last crystal to dissolve | | | | Details |
| LCV | Liquid Control Valve | | | | Details |
| LCV | Level Control Valve (like the actuator on the separator) | | | | Details |
| LCV | level control valve | | | | Details |
| LD | Layer Depth | | | | Details |
| LD | Lay Down (tubing, rods, etc.) | | | | Details |
| LD | Liquidated Damages | | | | Details |
| LD | lay down | | | | Details |
| LD | laid down | | | | Details |
| ld | load | | | | Details |
| ld(s) | land(s) | | | | Details |
| LDC | local distribution companies | | | | Details |
| LDC | laid-down cost | | | | Details |
| LDC | local distribution company | | | | Details |
| LDCA | LINC Downhole Coupler Assembly | | | | Details |
| LDCX | lead drill collar | | | | Details |
| LDDCs | laid(laying) down drill collars | | | | Details |
| LDDP | laid(laying) down drillpipe | | | | Details |
| LDFL | large-diameter flow line | | | | Details |
| LDFN | lay down for night | | | | Details |
| LDG | landing | | | | Details |
| LDG | loading | | | | Details |
| LDHI | Low dose hydrate inhibitors | | | | Details |
| L-DK | loading dock | | | | Details |
| LDL | Litho Density Log | | | | Details |
| LDL | Lithology Density Log | | | | Details |
| LDN | LaDeN | | | | Details |
| LDP | Large Diameter Probe | | | | Details |
| LDPE | Low Density Polyethylene | | | | Details |
| LDR | loader | | | | Details |
| LDS | Lock Down Sleeve (drilling riser) | | | | Details |
| LDS | Litho Density Sonde | | | | Details |
| LDT | Litho Density | | | | Details |
| LDT | Litho-Density | | | | Details |
| LDTEP | LDT EPT Gamma Ray Log | | | | Details |
| LDV | light duty vehicles | | | | Details |
| LE | LEBANON | | | | Details |
| Le C | Le Comptom | | | | Details |
| Leadv | Leadville | | | | Details |
| LEAKL | Leak Detection Log | | | | Details |
| LEH-MT | Logging Equipment Head with Tension and Mud Temperature | | | | Details |
| LEH-T | Logging Equipment Head with Tension | | | | Details |
| LEL | Lowest Explosive Limit (lowest concentration of gas in air which will explode upon ignition. Below the LEL, the mixture is too lean) | | | | Details |
| LEL | lower explosive limit | | | | Details |
| Len | Lennep | | | | Details |
| len | lenticular | | | | Details |
| Lens | a permeable, often small sedimentary deposit bordered by impermeable rock | | | | Details |
| LEP | Laboratory for Exploration and Production | | | | Details |
| LEPRE | Litho-Elastic Property Report | | | | Details |
| LF | Low Frequency | | | | Details |
| LFA | Live Fluid Analyzer | | | | Details |
| LFO | light fuel oil | | | | Details |
| LG | LATVIA | | | | Details |
| lg | large | | | | Details |
| lg | length | | | | Details |
| lg | level glass | | | | Details |
| lg | long | | | | Details |
| Lg | Disc Large Discorbis | | | | Details |
| LGA | Liberated Gas Average (equal to the background gas) | | | | Details |
| LGA | Laboratoire de Geophysique Applique Algeria | | | | Details |
| LGD | Lower Glen Dean | | | | Details |
| Lge | league | | | | Details |
| LGP | Liberated Gas Produced | | | | Details |
| LGR | Liquid Gas Ratio | | | | Details |
| LGR | Local Grid Refinement | | | | Details |
| LGR | Liquid Gas Recovery | | | | Details |
| LGR | Local Grid Refinement | | | | Details |
| LGR | Liquids to Gas Ratio | | | | Details |
| LGS | Low (specific)Gravity Solids | | | | Details |
| LGS | Low Gravity Solids in mud | | | | Details |
| LGSC | Liquified Gas Shipping Co. Abu Dhabi | | | | Details |
| LGT | LenGThened | | | | Details |
| LH | Left Hand | | | | Details |
| LH | Liner Hanger | | | | Details |
| LH | LITHUANIA | | | | Details |
| LH/RP | long handle/round point | | | | Details |
| LHD | Low Head Drilling (a type of MPD that formation fluid is not produced to surface) | | | | Details |
| LHT | Left Hand Turn | | | | Details |
| LI | LIBERIA | | | | Details |
| LI | LIECHTENSTEIN | | | | Details |
| LI | level indicator | | | | Details |
| LI | Limestone Device | | | | Details |
| LIB | Lead Impression Block (see comment) | | | | Details |
| LIB | lead impression block | | | | Details |
| LIB | light iron barrel | | | | Details |
| LIC | level indicator controller | | | | Details |
| lic | license | | | | Details |
| LIE | LIECHTENSTEIN | | | | Details |
| Lieb | Liebuscella | | | | Details |
| LIF | Land of Israel Front | | | | Details |
| lig | lignite , lignite | | | | Details |
| lig | lignite, lignitic | | | | Details |
| LIGB | light iron grease barrel | | | | Details |
| LIH | Lost In Hole | | | | Details |
| LIH | Left in Hole | | | | Details |
| LII | Liquid Isotope Injector | | | | Details |
| LIL | Log-Inject-Log | | | | Details |
| lim | limit, limonite | | | | Details |
| LIMS | Laboratory Information Management System | | | | Details |
| lin | linear | | | | Details |
| lin | liner | | | | Details |
| lin | ft linear foot | | | | Details |
| LINC | Latched Inductive Coupling (SLB data Acquisition) | | | | Details |
| LINCO | Liner and Completion Progress Report | | | | Details |
| LINUX | Linus torvalds UniX | | | | Details |
| LIOG | Lithography Log | | | | Details |
| LIOGA | Louisiana Independent Oil & Gas Association | | | | Details |
| LIP | local injections plants | | | | Details |
| liq | liquid | | | | Details |
| liqftn | liquefaction | | | | Details |
| LIRA | Logistic and Infrastructure Resource Assessment | | | | Details |
| LIT | Lead Impression Tool | | | | Details |
| LITDE | Litho Density Quicklook Log | | | | Details |
| LITH | Li tho logy | | | | Details |
| LITH | Lithology | | | | Details |
| litho | lithologic | | | | Details |
| litho | lithographic | | | | Details |
| LITHR | Lithological Description Report | | | | Details |
| LITRE | Lithostratigraphy Report | | | | Details |
| LITST | Lithostratigraphic Log | | | | Details |
| LJ | lap joint | | | | Details |
| LK | Linerkopf | | | | Details |
| LK | SRI LANKA | | | | Details |
| lk | leak | | | | Details |
| lk | lock | | | | Details |
| LKA | SRI LANKA | | | | Details |
| LKG | leakage | | | | Details |
| LKH | Lowest Known Hydrocarbons (for determining SEC GIIP or *STOIIP) | | | | Details |
| LKH | Lowest Known Hydrocarbons | | | | Details |
| LKM | Line Kilo Metre | | | | Details |
| LKO | Lowest Known Oil | | | | Details |
| LKP | Langwellenkreisel-Pumpen | | | | Details |
| LKR | locker | | | | Details |
| LKV | Lower Kelly Valve | | | | Details |
| LL | Lessons Learnt | | | | Details |
| LL | Laterolog | | | | Details |
| LL | Long Lead | | | | Details |
| LL | Liquid Level | | | | Details |
| LL | Lifetime Log | | | | Details |
| Ll | Limestone Device | | | | Details |
| LL GR-N | Laterlog-Gamma Ray-Neutron Log | | | | Details |
| LL&E | Louisiana Land & Exploration Co. | | | | Details |
| LL/GR | Laterolog-Gamma Ray | | | | Details |
| LL/GR/NEU | Laterolog-Gamma Ray-Neutron | | | | Details |
| LL/NEU | Laterolog-Neutron | | | | Details |
| LL3 | Laterolog 3 | | | | Details |
| LL3 | Laterolog | | | | Details |
| LLC | Limited Liability Company | | | | Details |
| LLC | liquid level controller | | | | Details |
| LLD | Laterolog Deep | | | | Details |
| LLDPE | Linear Low-Density Polyethylene | | | | Details |
| LLG | liquid level gauge | | | | Details |
| LLI | Long Lead Items (such as casing, Xmas tree, …) | | | | Details |
| LLRT | liquid level leak test | | | | Details |
| LM | Line Manager | | | | Details |
| lm | limestone | | | | Details |
| lm | lime, limestone | | | | Details |
| LM1 | Short Line DC 0264 | | | | Details |
| LM2 | Short Line DC 0265 | | | | Details |
| LM3 | Leutert MG 3000 (ausgesch.) | | | | Details |
| LM4 | Leutert MG 4000 (ausgesch.) | | | | Details |
| LM5 | Short Line DC 1096 | | | | Details |
| LM6 | Short Line DC 1097 | | | | Details |
| LM7 | Short Line DC 1592 | | | | Details |
| LMAP | Location Map | | | | Details |
| LMF | lowermost flange | | | | Details |
| LMGV | Lower Master Gate Valve | | | | Details |
| LMn | Lower Menard | | | | Details |
| LMP | Liquid Mud Plant | | | | Details |
| LMP | last measured pressure | | | | Details |
| Lmpy | lumpy | | | | Details |
| LMR | Lower Marine Riser | | | | Details |
| LMRP | Lower Marine Riser Package | | | | Details |
| LMS | Limestone | | | | Details |
| LMS | Learning Management System | | | | Details |
| Lmst | Limestone | | | | Details |
| LMTD | log mean temperature difference | | | | Details |
| LMV | Lower Master Valve (on an Xmas tree) | | | | Details |
| LMV | Lower Master Valve | | | | Details |
| LMWL | Local Meteoric Water Line | | | | Details |
| lmy | limy | | | | Details |
| Lmy | sh limy shale | | | | Details |
| LN | Landenippel | | | | Details |
| LN | Lost Nozzle | | | | Details |
| LN | line | | | | Details |
| ln | logarithm(natural) | | | | Details |
| LNE | Laboratoire National d'Essais | | | | Details |
| lnfo | information | | | | Details |
| LNFT-IA | liquid, no flow test, inside annulus | | | | Details |
| LNG | Liquified Natural Gas | | | | Details |
| LNG | Liquefied Natural Gas | | | | Details |
| LNG | see liquefied natural gas | | | | Details |
| lngl | linguloid | | | | Details |
| Lnr | liner | | | | Details |
| lns | lense | | | | Details |
| LO | SLOVAKIA (SLOVAK REPUBLIC) | | | | Details |
| LO | Load Oil | | | | Details |
| LO | lube oil | | | | Details |
| Lo Ho | Lower Hold | | | | Details |
| LOA | Letter Of Approval, Letter Of Acceptance | | | | Details |
| LOA | Letter Of Application | | | | Details |
| LOA | Letter Of Award | | | | Details |
| LOA | Lenght Over All | | | | Details |
| LOA | Letter of Authorisation/Agreement/Authority | | | | Details |
| LOA | Letter of Acceptance | | | | Details |
| LOA | length overall | | | | Details |
| LOC | Limiting oxygen concentration (see comment) | | | | Details |
| loc | location | | | | Details |
| loc | located, location | | | | Details |
| loc | abnd location abandoned | | | | Details |
| loc | gr location graded | | | | Details |
| Lock | a mechanism to hold a plug in a profile | | | | Details |
| LOE | Lease Operating Expenses | | | | Details |
| Loess | deposits of windborne dust | | | | Details |
| LOF | Lloyd’s Open Form | | | | Details |
| LOF | List Of Field | | | | Details |
| LOG | Logging Run | | | | Details |
| Log | a systematic recording of data from a well | | | | Details |
| log | logarithm(common) | | | | Details |
| LOGGN | Logging Whilst Drilling | | | | Details |
| LOGRS | Log Restoration Report | | | | Details |
| LOGSM | Log Sample | | | | Details |
| LOI | Letter Of Intend | | | | Details |
| LOI | Letter Of Indemnity. | | | | Details |
| LOK | Liner Oberkante | | | | Details |
| LOL | Laugh out loud | | | | Details |
| LOLER | Lifting Operations and Lifting Equipment Regulations | | | | Details |
| LOLO | Lift On Lift Off ship | | | | Details |
| long | longitude | | | | Details |
| long | longitude(inal) | | | | Details |
| LOOP | Lock Open | | | | Details |
| LOP | Lock Open Position | | | | Details |
| LOPA | Layer of Protection Analysis | | | | Details |
| LOR | Letter Of Recommendation | | | | Details |
| LOR | Land Owner Royalty | | | | Details |
| LOR | Lindsey Oil Refinery Ltd. UK | | | | Details |
| LOS | lease operations | | | | Details |
| Losal | low salt or fresher water | | | | Details |
| LOT | Leak off test | | | | Details |
| LOT | Linear Override Tool | | | | Details |
| LOT | Lock Open Tool | | | | Details |
| LOT | Leak-Off Test | | | | Details |
| LOTO | Lock Out / Tag Out | | | | Details |
| Lov | Lovell | | | | Details |
| Lov | Lovington | | | | Details |
| LOW | Last Open Water | | | | Details |
| low | lower | | | | Details |
| LOX | liquid oxygen | | | | Details |
| LP | Low Pressure | | | | Details |
| LP | Lokset-Packer | | | | Details |
| LP | Landing Point | | | | Details |
| LP | line pressure | | | | Details |
| LP | lodge pole | | | | Details |
| lp | loop | | | | Details |
| LP | sep low-pressure separator | | | | Details |
| LPG | Liquefied Petroleum Gas | | | | Details |
| lPG | initial potential gas lift | | | | Details |
| LPG | propane | | | | Details |
| LP-Gas | liquefied petroleum gas | | | | Details |
| LPH | Litres Per Hour | | | | Details |
| lpm | Liter Per Minute | | | | Details |
| LPO | local purchase order | | | | Details |
| LPP | Low Pressure Pilot | | | | Details |
| LPR | Lower Pipe Rams | | | | Details |
| LPR | Tester valves (Halliburton) | | | | Details |
| LPR | Low Permeability Reservoir | | | | Details |
| LPRN | Tester valves (Halliburton) | | | | Details |
| LPS | LumPSum | | | | Details |
| LPS | low pressure separator | | | | Details |
| LPS | low-pressure separation | | | | Details |
| LPSA | laser particle size analysis | | | | Details |
| LPSD | laser particle size distribution | | | | Details |
| LPSG | Low Pressure Slick Gun | | | | Details |
| LPT | Low Pressure Test | | | | Details |
| LPWHH | Low Pressure Well Head Housing | | | | Details |
| LQ | PALMYRA ATOLL | | | | Details |
| LQHC | Low quality hydrocarbons (i.e., tar sands and oil shale) | | | | Details |
| LQQ | PALMYRA ATOLL | | | | Details |
| LR | Lloyds Register of Shipping | | | | Details |
| LR | Large Range | | | | Details |
| LR | LIBERIA | | | | Details |
| LR | Legacy Rehost | | | | Details |
| LR | level recorder | | | | Details |
| LR | long radius | | | | Details |
| LRAP | long-range automation plan | | | | Details |
| LRC | level recorder controller | | | | Details |
| lrg | large | | | | Details |
| LRP | Lower Riser Package | | | | Details |
| LRP | Low Resistivity Pay | | | | Details |
| LRP | long-range plan | | | | Details |
| LRT | LINC Running Tool (SLB data Acquisition) | | | | Details |
| LRTAP | Long-Range Transboundary Air Pollution | | | | Details |
| LRTC | LINC Running Tool Cartridge (SLB data Acquisition) | | | | Details |
| LRTL | LINC Running Tool Latch (SLB data Acquisition) | | | | Details |
| LS | Landing String (subsea completions) | | | | Details |
| LS | Long String (dual tubing) | | | | Details |
| LS | Lost Seal ( in an WFT job) | | | | Details |
| LS | Liner Shoe | | | | Details |
| LS | Least Squares | | | | Details |
| LS | Long String | | | | Details |
| LS | LIECHTENSTEIN | | | | Details |
| LS | LESOTHO | | | | Details |
| LS | low sulfur | | | | Details |
| ls | limestone | | | | Details |
| LS | Lost Circulation | | | | Details |
| LS | Lock Set | | | | Details |
| ls | limestone | | | | Details |
| LSA | Low Specific Activity scale | | | | Details |
| LSBGR | Long Spacing BHC GR Log | | | | Details |
| LSCI | LINC Surface Computer Interface (SLB data Acquisition) | | | | Details |
| LSD | Lashed Secured Dunnage | | | | Details |
| LSD | Land Surface Datum | | | | Details |
| LSD | legal subdivision(Canada) | | | | Details |
| LSD | light steel drum | | | | Details |
| lse | lease | | | | Details |
| LSFO | low sulfur fuel oil | | | | Details |
| LSL | Limestone | | | | Details |
| LSL | Limestone Log | | | | Details |
| LSO | LESOTHO | | | | Details |
| LSOBM | low solids oil base mud | | | | Details |
| LSP | Lockset Packer | | | | Details |
| LSP | Lockset-Packer | | | | Details |
| LSPD | Line Speed (wireline) | | | | Details |
| LSS | Long Spaced Sonic | | | | Details |
| LSS | Long Spaced Sonic | | | | Details |
| LSS | Long-Spacing Sonic Log | | | | Details |
| LSS | Long-Spaced Sonic | | | | Details |
| LSSON | Long Spacing Sonic Log | | | | Details |
| LST | Low Stand (Geologic deposition) | | | | Details |
| Lst | Limestone | | | | Details |
| LST | Low Stand System Track | | | | Details |
| LST | Life Support Technician (in diving operations) | | | | Details |
| LSTK | Lump Sum Turnkey | | | | Details |
| lstr | lustre | | | | Details |
| LSV | Low Shear Value | | | | Details |
| LSYP | Low Shear Yield Point | | | | Details |
| LT | Low Temperature | | | | Details |
| LT | Low Torque valve | | | | Details |
| LT | Linear Time or Lag Time | | | | Details |
| LT | Long Term | | | | Details |
| LT | Level Transmitter (in a separator) | | | | Details |
| LT | LESOTHO | | | | Details |
| LT | LITHUANIA | | | | Details |
| lt | light | | | | Details |
| LT | Lost Teeth/Cutters | | | | Details |
| lt | Laut (according to…) | | | | Details |
| lt | light | | | | Details |
| LT | lower tubing | | | | Details |
| LT (LTONS) | Long TONS. | | | | Details |
| LT valve | Low Torque valve | | | | Details |
| LT&C | long thread and coupled, a connection description | | | | Details |
| LT&C | long threads and coupling | | | | Details |
| LT/cd | long tons of sulfur per calendar day | | | | Details |
| LTA | lost time accident | | | | Details |
| LTBS | liner tie back sleeve | | | | Details |
| LTC | Lost Time Case | | | | Details |
| LTCS | Low Temperature Carbon Steel | | | | Details |
| LTCW | Long Term Capacity Workshop | | | | Details |
| LTD | light | | | | Details |
| LTD | log total depth | | | | Details |
| ltd | limited | | | | Details |
| LTD | Logger’s Total Depth | | | | Details |
| LTDP | Long Term Development Plan | | | | Details |
| LTDS | Long Term Drilling Sequence | | | | Details |
| ltg | lighting | | | | Details |
| LTI | Lost Time Incident (see comment) | | | | Details |
| LTI | Lost Time Injury | | | | Details |
| LTI(FR) | Lost Time Incident (Frequency Rate) | | | | Details |
| LTIF | Lost Time Incident Frequency | | | | Details |
| LTIF | Lost Time Injury Frequency | | | | Details |
| LTIFR | lost time injury frequency rate | | | | Details |
| LTIS | Lost Time Injury Severity | | | | Details |
| LTL | less than truckload | | | | Details |
| ltl | little | | | | Details |
| LtO | License to Operate | | | | Details |
| LTO | Light Tight Oil | | | | Details |
| LTOBM | low toxicity oil based mud | | | | Details |
| LT-OBM | Low Toxicity - Oil Based Mud | | | | Details |
| LTPF | Long Term Production Forecast | | | | Details |
| LTPF | Low Tension Polymer Flooding | | | | Details |
| ltr | letter | | | | Details |
| LTRM | long term reservoir management | | | | Details |
| LTS | low temperature separation | | | | Details |
| LTS | Unit low-temperature separation unit | | | | Details |
| LTSD | low-temperature shutdown | | | | Details |
| LTSI | long term shut-in | | | | Details |
| LTT | long-term tubing test | | | | Details |
| LTU | LITHUANIA | | | | Details |
| LTV | Low Torque valve | | | | Details |
| LTV | Low Temperature Valve | | | | Details |
| LTX | unit low-temperature extraction unit | | | | Details |
| LU | LUXEMBOURG | | | | Details |
| LUB | lubricator | | | | Details |
| lub | lubricate(ed)(ing)(tion) | | | | Details |
| LUBRIESUR | Lubricantes del Sur S.A. Spain | | | | Details |
| LUBRINER | Lubricantes Nervion S.A. Spain | | | | Details |
| LUBRITURIA | Lubricantes Turia S.A. Spain | | | | Details |
| LUBV | Lubricator Valve | | | | Details |
| Lued | Lueders | | | | Details |
| LUG | Ise use gas | | | | Details |
| LUK | Liner Unterkante | | | | Details |
| LUK | Lukoil Russia | | | | Details |
| LUMI | Luminescence Log | | | | Details |
| LUN | Logical Unit Number | | | | Details |
| LUST | Leaking Underground Storage Tanks | | | | Details |
| LUX | LUXEMBOURG | | | | Details |
| LUX | light hytrocrackate | | | | Details |
| LV | LATVIA | | | | Details |
| LV | liquid volume | | | | Details |
| LVA | LATVIA | | | | Details |
| LVBR | Low Value Budget Request | | | | Details |
| LVEL | Linear Velocity Log | | | | Details |
| LVI | low viscosity index | | | | Details |
| lvl | level | | | | Details |
| Lvnwth | Leavenworth | | | | Details |
| L-VOLT | low voltage | | | | Details |
| LVOT | Linear Valve Override Tool | | | | Details |
| LVPO | Low Value Purchase Order | | | | Details |
| LW | Low Water | | | | Details |
| LW | load water | | | | Details |
| LW | Lagerstätte Wasser | | | | Details |
| LW | lapweld | | | | Details |
| LWC | Lost Work Day (HSE KPI, see comment) | | | | Details |
| LWC | Lost Workday Case | | | | Details |
| LWD | Logging While Drilling | | | | Details |
| LWD | Lost Workdays (see comment) | | | | Details |
| LWD | see Logging While Drilling | | | | Details |
| LWDC | Lost Work Day Case | | | | Details |
| LWDI | Lost Work Day Incident | | | | Details |
| LWF | Logging While Fishing | | | | Details |
| LWL | low water loss | | | | Details |
| LWOP | Logging Well on Paper | | | | Details |
| lwr | lower | | | | Details |
| LWRP | lower workover riser package | | | | Details |
| LX | LUXEMBOURG | | | | Details |
| LxR | links rechts Übergang | | | | Details |
| LY | LIBYA | | | | Details |
| m/l | more or less | | | | Details |
| M/PLT | masking plate | | | | Details |
| MACL | Multiarm Caliper Log | | | | Details |
| MAGL | Nuclear Magnetism | | | | Details |
| mall | malleable | | | | Details |
| MAPL | Michigan Association of Petroleum Landmen | | | | Details |
| Marg. fl. | Marginulina flat | | | | Details |
| MARICONSULT | Technical support to Transmed Algeria | | | | Details |
| MARPOL | Marine Pollution | | | | Details |
| matl | material | | | | Details |
| Mbal | material balance calculation of fluid production | | | | Details |
| MBL | Thousand barrels of petroleum liquids; includes crude, condensate & natural gas liquids | | | | Details |
| Mbl | Fls Marble Falls | | | | Details |
| MBNGL | Thousand Barrels of Natural Gas Liquids | | | | Details |
| MC ls | Moore County lime | | | | Details |
| McCul | McCullough | | | | Details |
| McEl | McElroy | | | | Details |
| MCFL | Micro-Cylindrically Focused Log | | | | Details |
| McL | McLish | | | | Details |
| McMill | McMillan | | | | Details |
| MCVL | Multicycle Circuating Valve with Lock module (see comment!) | | | | Details |
| MDBRL | Measured Depth Below Reference Level | | | | Details |
| MDL | Minimum Data List | | | | Details |
| MDL | Methane Drainage Licence (United Kingdom), a type of onshore licence allowing natural gas to be collected "in the course of operations for making and keeping safe mines whether or not disused" | | | | Details |
| mdl | middle | | | | Details |
| MDL_R | Compact Dual Laterolog Sonde | | | | Details |
| MDLT | Medium Dual Laterolog | | | | Details |
| MeCl | methylene chloride | | | | Details |
| MEDGULF | Mediterranean and Gulf Insurance and Reinsurance Company | | | | Details |
| MEGAL | Mittle-Europaische-Gasleitungsgesellschaft Germany | | | | Details |
| MEL | Maximum Exposure Limit | | | | Details |
| MEL | Micro Eletric Log | | | | Details |
| MEPRL | Mechanical Properties Log | | | | Details |
| meth-bl | methylene blue | | | | Details |
| meth-cl | methyl chloride | | | | Details |
| methol | methanol | | | | Details |
| METL | Multifrequency Electromagnetic Thickness Log | | | | Details |
| MFLD | Mechanical Fluid Loss Device (Completion tool) | | | | Details |
| mg/L | milligrams per liter | | | | Details |
| MGIL | Mud Gas Isotope Analysis | | | | Details |
| MGL | Magnelog | | | | Details |
| MGL | mean ground level | | | | Details |
| MGLN | Magneline | | | | Details |
| MHL | MARSHALL ISLANDS | | | | Details |
| MICL | Micro | | | | Details |
| MICL | Micro Log | | | | Details |
| MICL | Microlog | | | | Details |
| MICLOG | Microlog | | | | Details |
| MIL | Milling Run | | | | Details |
| mil | military | | | | Details |
| Mill | a cutting tool used to grind up metal, dress off a fish, or open up a window for a kick-off | | | | Details |
| mill | milliotitic | | | | Details |
| millg | milling | | | | Details |
| Milli | prefix meaning one thousandth | | | | Details |
| MINL | Minilog | | | | Details |
| MINL | Mini | | | | Details |
| Minl | Minnelusa | | | | Details |
| MIPAL | Micropalaeo Log | | | | Details |
| ML | Microlog | | | | Details |
| mL | meter Low (e.g. 7 mL means that layer have detected 7 m deeper than prognosed) | | | | Details |
| ML | Mud Line | | | | Details |
| ML | Mud Log (or Mud Logging ) | | | | Details |
| ML | Microlog, or Mud Log | | | | Details |
| ML | Multi-Lateral | | | | Details |
| ML | Minilog | | | | Details |
| ML | MALI | | | | Details |
| ML | Mining lease | | | | Details |
| Ml | Michigan | | | | Details |
| ML | Contact Caliper | | | | Details |
| ML | Micro | | | | Details |
| ML | Mini | | | | Details |
| ml | milliliter | | | | Details |
| ML | mud logger | | | | Details |
| ml | TEL milliliters tetraethyl lead per gallon | | | | Details |
| ml | milled | | | | Details |
| ML | Proximity-Microlog | | | | Details |
| ML | Mini | | | | Details |
| ML | Minilog® | | | | Details |
| ML/CAL | Minilog Caliper | | | | Details |
| ML/CAL/GR | Minilog Caliper Gamma Ray | | | | Details |
| MLAT | Microlateral | | | | Details |
| MLC | Microlog Calliper | | | | Details |
| mLD | meter Logging Depth | | | | Details |
| mld | milled | | | | Details |
| MLE | Motor Lead Extension (ESP motor flat) | | | | Details |
| Mle | milled one end | | | | Details |
| MLF | Marine Loading Facility | | | | Details |
| mlg | milling | | | | Details |
| MLH | Mud Liner Hanger | | | | Details |
| MLI | MALI | | | | Details |
| MLL | Microlaterolog | | | | Details |
| MLL | Micro Laterolog | | | | Details |
| MLL | Forxo | | | | Details |
| MLL | Microlateral | | | | Details |
| MLL | Minifocus | | | | Details |
| MLL | master load list | | | | Details |
| MLL/CAL | Microlaterolog-Caliper | | | | Details |
| MLP | Multi-Layer Perceptron | | | | Details |
| MLS | Mud Line Suspension | | | | Details |
| MLT | Microlog | | | | Details |
| MLT | MALTA | | | | Details |
| MLT | mud line temperature | | | | Details |
| MLU | mud logging unit | | | | Details |
| MLW | mean low wave | | | | Details |
| MLW-PLAT | mean low water to platform | | | | Details |
| Mly | marly | | | | Details |
| MM lb | million pounds | | | | Details |
| MMBBL | Million barrel | | | | Details |
| MMBL | Million barrels of petroleum liquids; includes crude, condensate, & natural gas liquids | | | | Details |
| MMbls | million barrels | | | | Details |
| MMBLS | millions of barrels | | | | Details |
| MMBNGL | Million barrels of natural gas liquids | | | | Details |
| MMgal/day | million gallons per day | | | | Details |
| MML | Compact Microlog | | | | Details |
| MNL | manual | | | | Details |
| mnrl | mineral | | | | Details |
| MobiNil | Mobile Nile | | | | Details |
| MOCL | Mobil Oil Co. Ltd.UK | | | | Details |
| MOL | Mogyar Olaj-es Gazipari RT | | | | Details |
| MOL | Main Oil Line | | | | Details |
| mol | molasse | | | | Details |
| mol | mole | | | | Details |
| MOL | molecule, molecular | | | | Details |
| mol | mollusca | | | | Details |
| mol | wt molecular weight | | | | Details |
| MOL | Magyar Olaj es Gasipari Reszvenytarsasag (Hungarian Oil & Gas Co. Ltd.) Hungary | | | | Details |
| MOLCHOP | More Or Less CHarterers OPtion | | | | Details |
| MOLOO | More Or Less Owners (Masters) Option | | | | Details |
| MPAL | Magellan Petroleum Australia Ltd. Australia | | | | Details |
| MPGH-Lith | multipurpose grease lithium base | | | | Details |
| MPhil | Master of Philosophy | | | | Details |
| MPL | Murco Petroleum Limited UK | | | | Details |
| MPLT | memory production logging tool | | | | Details |
| MRIL | Magnetic Resonance Imaging Log | | | | Details |
| MRIL-WD | Magnetic Resonance Image Logging | | | | Details |
| MRLD | Mechanical Rigid Lockdown tool (Drill euipment tool) | | | | Details |
| mrlst | marlstone | | | | Details |
| MSFL | Micro SFL Log | | | | Details |
| MSFL | Micro Spherically focused Log | | | | Details |
| MSFL | Micro Spherically Focused Log | | | | Details |
| MSFL | Micro-Spherically Focused Log | | | | Details |
| MSFL | Micro Spherically Focused Log | | | | Details |
| MSFL | Microspherically Focused log | | | | Details |
| MSFL | Microlaterolog Focused Log | | | | Details |
| MSG-CBL | Micro-Seismogram Log, Cased Hole | | | | Details |
| MSG-CBL-G | Micro-Seismogram Gamma Collar | | | | Details |
| MSG-CBL-N | Micro-Seismogram Neutron Collar | | | | Details |
| MSL | Micro Spherical Log | | | | Details |
| MSL | Mean Sea Level | | | | Details |
| MSL | Micro Spherical Laterolog | | | | Details |
| mtl | material | | | | Details |
| MULTX | multiply, multiplexer | | | | Details |
| MuSol | Mutual Solvent | | | | Details |
| MVL1 | Multi-Channel Vertiline 4-1/2in. (114mm) | | | | Details |
| MVL2 | Multi-Channel Vertiline 5-1/2 in (140mm) | | | | Details |
| MVL3 | Multi-Channel Vertiline 7 in. (178 mm) | | | | Details |
| MVL4 | Multi-Channel Vertiline 8-5/8 in. (219 mm) | | | | Details |
| MVTL | Multi-Channel Vertiline | | | | Details |
| N' ly | northerly | | | | Details |
| N.Y.K.Line | Nippon Yusen Kaisha | | | | Details |
| N’ly | northerly | | | | Details |
| NaCl | Sodium Chloride (table salt) | | | | Details |
| NaCl | sodium chloride salt Halite | | | | Details |
| NaCL | sodium chloride | | | | Details |
| NAFTAL | Entreprise Nationale de Raffinage et de Distribution des Produits Petroliers Algeria | | | | Details |
| NALRD | Northern Alberta Land Registration district | | | | Details |
| Nat 'l | National | | | | Details |
| nat’l | national | | | | Details |
| NCL | NEW CALEDONIA | | | | Details |
| NCL | Neutron Collar Log | | | | Details |
| Ndl | Cr Noodle Creek | | | | Details |
| NEL | northeast line | | | | Details |
| NELP | New Exploration and Licensing Polley | | | | Details |
| NETL | National Energy Technology Laboratory | | | | Details |
| NETL | National Energy Technology Laboratory, DOE | | | | Details |
| NFL | Nuclear Flolog | | | | Details |
| NFL/GR | Nuclear Flolog-Gamma Ray | | | | Details |
| NFL/GR/NEU | Nuclear Flolog-Gamma Ray Neutron | | | | Details |
| NFL/NEU | Nuclear Flolog-Neutron | | | | Details |
| NGL | Natural Gas Liquids | | | | Details |
| NGL | Natural gas liquids (ethane, propane, butane, isobutane and natural gasoline) | | | | Details |
| NGL | natural gas liquids | | | | Details |
| NGLQT | NGT QL Log | | | | Details |
| NGLs | Natural Gas Liquids | | | | Details |
| NGTLD | NGT LDT QL Log | | | | Details |
| NH4Cl | ammonium chloride | | | | Details |
| NIL | Nothing | | | | Details |
| NL | Neutronlog | | | | Details |
| NL | NETHERLANDS | | | | Details |
| NL | Non Linear | | | | Details |
| NL | north line | | | | Details |
| NL | Gas nonleaded gas | | | | Details |
| NL | Neutron Logging | | | | Details |
| NL | Neutron Log | | | | Details |
| NLA | No Leasing, Administrative | | | | Details |
| NLA/LUP | No Leasing, Administrative/Land Use Planning | | | | Details |
| NLD | NETHERLANDS | | | | Details |
| NLGI | National Lubricating Grease Institute | | | | Details |
| NLL | neutron lifetime log | | | | Details |
| NLL | Neutron Lifetime | | | | Details |
| NLL/GR | Neutron Lifetime Gamma Ray | | | | Details |
| NLL/GR/NEU | Neutron Lifetime G/R-Neutron | | | | Details |
| NLL/NEU | Neutron Lifetime Neutron | | | | Details |
| NLNG | Nigerian LNG Nigeria | | | | Details |
| NLPGA | National Liquefied Petroleum Gas Association | | | | Details |
| NLRB | National Labor Relations Board | | | | Details |
| NLS | No Leasing, Statutory or Executive Order | | | | Details |
| NMAGL | Nuclear Magnetism | | | | Details |
| NML | Nuclear Magnetism | | | | Details |
| NOEL | no-observed-effect level | | | | Details |
| NOISL | Noise Log | | | | Details |
| Nozzle | a shaped orifice for directing fluid flow | | | | Details |
| NPL | NEPAL | | | | Details |
| NPL | nipple | | | | Details |
| NPLC | Nuclear Porosity Lithology | | | | Details |
| NPLT | Nuclear Porosity Lithology | | | | Details |
| NPSL | American Standard Straight Locknut Pipe Thread | | | | Details |
| NREL | National Renewable Energy Laboratory, a laboratory of the US Department of Energy | | | | Details |
| NTEL | no-toxic-effect level | | | | Details |
| NWL | northwest line | | | | Details |
| NYL | nylon | | | | Details |
| Nylon | a polyamide material | | | | Details |
| NZL | NEW ZEALAND | | | | Details |
| O&GCLW | oil & gas cut load water | | | | Details |
| O&GCLW | oil and gas-cut load water | | | | Details |
| O&GL | oil and gas lease | | | | Details |
| OAL | OverAll Length (normally for x-overs) | | | | Details |
| OAL | overall length | | | | Details |
| OBDTL | OBDT Log | | | | Details |
| obsol | obsolete | | | | Details |
| OCL | Quality Control Log | | | | Details |
| OCSLA | Outer Continental Shelf Lands Act | | | | Details |
| Odel | O’Dell | | | | Details |
| OEL | Occupational Exposure Limit | | | | Details |
| OFL | overflush(ed) | | | | Details |
| OFLU | oil fluorescence | | | | Details |
| OGDCL | Oil & Gas Development Company Limited | | | | Details |
| OGLV | operating gas lift valve | | | | Details |
| Oil | Oil India Umited | | | | Details |
| Oil | Cr Oil Creek | | | | Details |
| oilfract | Oil fractured | | | | Details |
| OILINVEST | Intl. Arm of NOC Libya Libya | | | | Details |
| OILREC | OIL RECovery | | | | Details |
| OL | off / on location | | | | Details |
| OL | open line(no choke) | | | | Details |
| OL | Log Overlays | | | | Details |
| OLADE | Organization Latinoamericana de Energia Ecuador | | | | Details |
| OLE | Object Linking and Embedding | | | | Details |
| ole | olefin | | | | Details |
| OLECASA | Oleoductos Canarios S.A. Spain | | | | Details |
| OLF | Norwegian Oil Industry Assn. Norway | | | | Details |
| Olig | Oligocene | | | | Details |
| OLN | outline | | | | Details |
| olv | olive | | | | Details |
| OML | Oil Mining License (Nigeria) | | | | Details |
| OMRL | Oriented Micro | | | | Details |
| OMRL | OMRL Log | | | | Details |
| OMRL | Oriented Micro-Resistivity Log | | | | Details |
| OMRL | oriented microresistivity | | | | Details |
| ool | oolitic | | | | Details |
| OOWLL | Order On WireLine Logging | | | | Details |
| OPL | Operations Log | | | | Details |
| OPTL | optional | | | | Details |
| ORL | Oil Refineries Ltd. Israel | | | | Details |
| OSL | Oil Search Ltd. New Guinea | | | | Details |
| OTL | Operations Team Leader | | | | Details |
| Otl | outlet | | | | Details |
| OVL | ONGC indian company | | | | Details |
| P & L | Profit & Loss statement (see comment) | | | | Details |
| P Lar | Post Laramine | | | | Details |
| P&L | Profit & Loss statement (see comment) | | | | Details |
| P&L | profit and loss | | | | Details |
| P/BLDG | pump building | | | | Details |
| PAIL | Plunger Assisted Intermittent Lift | | | | Details |
| PAL | Palaeo Chart | | | | Details |
| PAL | producer, artificial lift | | | | Details |
| Pal | Paluxy | | | | Details |
| PAL | Pipe Analysis Log | | | | Details |
| Paleo | paleontology | | | | Details |
| Paleo | Paleozoic | | | | Details |
| Palo | P Palo Pinto | | | | Details |
| PALTEL | Palestine Telecommunications Co. Plc | | | | Details |
| PALYN | Palynological Analysis Report | | | | Details |
| Pan L | Panhandle Lime | | | | Details |
| PBHL | Proposed Bottom Hole Location | | | | Details |
| PBHL | proposed bottom-hole location | | | | Details |
| PBL | Paul B Lee who invented DP circ tool (for circulation of the mud/LCM during drilling) | | | | Details |
| PBL | Paul B Lee who invented DP circ tool | | | | Details |
| pbl(y) | pebble, pebbly | | | | Details |
| pble | pebble | | | | Details |
| pbls | pebbles | | | | Details |
| pbly | pebbly | | | | Details |
| Pcal | petacalorie | | | | Details |
| PCCL | Perforation Casing Collar Locator Log | | | | Details |
| PCL | Pipe Conveyed Logging | | | | Details |
| PCOLL | Perforation and Collar | | | | Details |
| PDKL | PDK Log | | | | Details |
| PEDL | Petroleum Exploration and Development Licence (United Kingdom), introduced in the th Onshore Licensing Round | | | | Details |
| PEL | Petroleum Economics Limited | | | | Details |
| PEL | Permissible Exposure Limit (see comment) | | | | Details |
| PEL | Permissible Exposure Limit | | | | Details |
| PEL | Petroleum Exploration License | | | | Details |
| pell | pellletal, pelletoidal | | | | Details |
| penal | penalty, penalize(ed)(ing) | | | | Details |
| PENL | Penetration Log | | | | Details |
| PERML | Permeability Log | | | | Details |
| PETLG | Petrophysical Evaluation Log | | | | Details |
| PETROBANGLA | Bangladesh Oil, Gas & Mineral Corporation Bangladesh | | | | Details |
| Petrobel | Belayim Petroleum Company | | | | Details |
| PETROBEL | Belayim Petroleum Co. Egypt | | | | Details |
| PETRO-COMMERCIAL | Empresa Estatal de Commercializacion y Transporte de Petroles del Ecuador Ecuador | | | | Details |
| PETROGAL | Petroleos de Portugal Portugal | | | | Details |
| PETRO-INDUSTRIAL | Empresa Estatal de Industrializacion de Petroles del Ecuador Ecuador | | | | Details |
| PETROL | Petrol, A Slovene Oil Company Slovenia | | | | Details |
| PHCL | Photoclinometer | | | | Details |
| PHL | PHILIPPINES | | | | Details |
| PHOL | Photon Log | | | | Details |
| PIL | Petrofac International Limited | | | | Details |
| PIL | Phasor Induction Log | | | | Details |
| Pill | a volume of gelled fluid mixed for a specific purpose A fluid loss pill for example | | | | Details |
| Pilot | a small scale test or trial used to assess the feasibility of a process to a reservoir or field | | | | Details |
| PILS | Platform Inline spinner in PLT tool of Schlumberger (Spinner) | | | | Details |
| PINTL | Production Interpretation | | | | Details |
| PISTL | pump in spinner temperature log | | | | Details |
| Pixel | Picture Element | | | | Details |
| PL | Production Licence (United Kingdom), a type of onshore licence issued before 1996 | | | | Details |
| PL | Price List | | | | Details |
| pl | Planned | | | | Details |
| PL | Production Licence | | | | Details |
| PL | POLAND | | | | Details |
| PL | pipeline | | | | Details |
| PL | Pennalog | | | | Details |
| PL | Proximity | | | | Details |
| PL | plate | | | | Details |
| PL | property line | | | | Details |
| pl fos | plant fossils | | | | Details |
| PL | Permalog | | | | Details |
| Plan. | palm. Planulina palmarie | | | | Details |
| Plan. har. | Planulina harangensis | | | | Details |
| plas | plastic | | | | Details |
| PLASR | plaster | | | | Details |
| platf | platform | | | | Details |
| PLATO | Pennzoil Offshore Gas Operators | | | | Details |
| PLC | Programmable Logic Controller | | | | Details |
| PLCA | Pipe Line Contractors Association | | | | Details |
| plcy | pelecypod | | | | Details |
| pld | pulled | | | | Details |
| PLE | plain large end | | | | Details |
| Pleist | Pleistocene | | | | Details |
| PLEM | Pipeline End Manifold | | | | Details |
| PLES | Pipeline End Structure | | | | Details |
| PLET | PipeLine End Termination (AKA FLET) | | | | Details |
| PLFO | PROFLOW | | | | Details |
| PLG | Plug Log | | | | Details |
| plg | pulling | | | | Details |
| plg | plagioclase | | | | Details |
| plgd | plugged | | | | Details |
| Plio | Pliocene | | | | Details |
| PLL | Potential Loss of Life | | | | Details |
| PLM | Pre-Laid Mooring (Offshore Rig) | | | | Details |
| PLMB | plumbing | | | | Details |
| pln | plan | | | | Details |
| plngr | plunger | | | | Details |
| PLO | pipeline oil | | | | Details |
| PLO | pumping load oil pilot | | | | Details |
| PLQL | Production Logging Quick Look (Schlumberger software) | | | | Details |
| PLRC | Professional Ladder Review Committee (old designation for CLRC) | | | | Details |
| PLS | Position Location System | | | | Details |
| PLSS | Public Land Survey System | | | | Details |
| PLT | Production Logging Tool (well) | | | | Details |
| PLT | Production Logging Tool | | | | Details |
| plt | pilot | | | | Details |
| PLT | pipeline terminal | | | | Details |
| plt | plant | | | | Details |
| PLT | Simultaneous Production Log | | | | Details |
| PLTQ | Production Logging Tool Quicklook Log | | | | Details |
| PLTRE | Production Logging Tool Report | | | | Details |
| plty | platy | | | | Details |
| PLV | pilot loaded valve | | | | Details |
| PLW | PALAU | | | | Details |
| PLW | pipe lapweld | | | | Details |
| PML | Proximity Log/Calliper/Microlog | | | | Details |
| PML | production management | | | | Details |
| PML | Proximity-Microlog | | | | Details |
| PNL | pulsed neutron log | | | | Details |
| pnl | panel | | | | Details |
| PNL | BD panel board | | | | Details |
| POHOL | Private Oil Holdings Oman Ltd. Oman | | | | Details |
| POL | POLAND | | | | Details |
| pol | polish(ed) | | | | Details |
| POL | Perforating Orientation Log | | | | Details |
| POLICOLSA | Poliolefinas Colombianas S.A. Colombia | | | | Details |
| poly | polymerization, polymerized | | | | Details |
| poly | cl polyethylene | | | | Details |
| polygas | polymerized gasoline | | | | Details |
| polypl | polypropylene | | | | Details |
| POT (able) | POTable water | | | | Details |
| PPL | Pakistan Petroleum Limited | | | | Details |
| PPL | Polymer Pathfinder Log | | | | Details |
| PPL | Pakistan Petroleum Ltd. Pakistan | | | | Details |
| PPLC | Professional Personnel Leadership Committee | | | | Details |
| prelim | preliminary | | | | Details |
| PRL | Pipe Recovery Log | | | | Details |
| PRL | Pipe Recovery | | | | Details |
| prly | pearly | | | | Details |
| prncpl-lss | principal lessee(s) | | | | Details |
| PROPEL | Produtos de Petroleo Lda. Portugal | | | | Details |
| PROX/ML | Proximity Minilog | | | | Details |
| PROXL | Proximity Log | | | | Details |
| prpl | purple | | | | Details |
| PRXL | Proximity | | | | Details |
| PSL | Product Specification Level | | | | Details |
| PSL | Product Service Line | | | | Details |
| PSL | Pressure Safety Low (low pressure pilot) | | | | Details |
| PSL | Pressure Switch Low | | | | Details |
| PSL | product specification level A rating for wellheads | | | | Details |
| PSL | public school land | | | | Details |
| PSL | pipe sleeve | | | | Details |
| PSLOG | Pressure Log | | | | Details |
| PSPL | PSP Leak Detection Log | | | | Details |
| PSTL | Project Services Team Lead | | | | Details |
| PSVAL | Pressure Evaluation Log | | | | Details |
| PtL | Produce the Limit | | | | Details |
| PTL | Production Technical Limit™ (BP Process)/Produce The Limit | | | | Details |
| PTL | production technical limits | | | | Details |
| PULS | pulse(sating)(sation) | | | | Details |
| pyls | pyrolysis | | | | Details |
| pyrclas | pyroclastic | | | | Details |
| QL | Quicklook Log | | | | Details |
| QLA | Quick Look Analysis | | | | Details |
| QLDT | Slim Xtreme Litho-Density Tool | | | | Details |
| QOL | Quality Of Living | | | | Details |
| QSLT | Slim Xtreme Sonic Logging Tool | | | | Details |
| Q-Tel | Qatar Public Telecommunications Corporation | | | | Details |
| QUAL | qualitative | | | | Details |
| qual | quality | | | | Details |
| R&L | road & location | | | | Details |
| R&LC | road & location complete | | | | Details |
| RAGL | raw gas lift | | | | Details |
| RALOG | running radioactive log | | | | Details |
| RBGL | Riser Based Gas Lift | | | | Details |
| RBLR | reboiler | | | | Details |
| Rbls | rubber balls | | | | Details |
| RCAL | Routine Core Analysis | | | | Details |
| RCL | Retainer Correlation Log | | | | Details |
| RCYL | recycle | | | | Details |
| RDL | Reservoir Data Log | | | | Details |
| redrld | redrilled | | | | Details |
| refl | reflection | | | | Details |
| refl | reflux | | | | Details |
| rel | relay | | | | Details |
| rel | release(ed) | | | | Details |
| REL | running electric log | | | | Details |
| reloc | relocate(ed) | | | | Details |
| repl | replace(ment) | | | | Details |
| REPSOL | Repsol S.A. (formerly “Hispanoil”)(see Repsol-YPF) Spain | | | | Details |
| REPSOL-YPF | Former Hispanoil (Spain) & YPF (Argentina) Spain | | | | Details |
| RESFL | Reservoir Fluid | | | | Details |
| RESL | Reservoir Log | | | | Details |
| RFLCT | reflect(ed)(ing)(tion) | | | | Details |
| RFLNG | Ready for Liquefied Natural Gas | | | | Details |
| RFLNG | Ready for LNG | | | | Details |
| RFQL | Repeat Formation Tester Quicklook | | | | Details |
| RIL | Riliance Company® | | | | Details |
| RIL | Reliance Industries limited | | | | Details |
| RIL | red indicating lamp | | | | Details |
| RL | Relief line | | | | Details |
| RL | random lengths | | | | Details |
| rlf | relief | | | | Details |
| rlg | railing | | | | Details |
| RLOF | Rock Load-out Facility | | | | Details |
| rls(d)(ing) | release(ed)(ing) | | | | Details |
| RLT | RigLess testing | | | | Details |
| RLT | Reservoir Limit Test | | | | Details |
| RLWI | Rig Less Well Intervention | | | | Details |
| RLWI | Riserless Light Well Intervention | | | | Details |
| rly | relay | | | | Details |
| RMLC | Request for Mineral Land Clearance | | | | Details |
| rmv(l) | remove(al)(able) | | | | Details |
| ROGL | rotative gas lift | | | | Details |
| ROL | Re-Order Level | | | | Details |
| ROL | rig on location | | | | Details |
| ROTLX | Reference Our TeLeX ...(date) | | | | Details |
| RPL | Reliance Petroleum Ltd. India | | | | Details |
| RTL | Realizing The Limit | | | | Details |
| RTL | Refinery Technology Laboratory | | | | Details |
| RTLTM | rate too low to measure | | | | Details |
| RUL | Regular unleaded gasoline | | | | Details |
| RYTLX | Reference Your TeLeX...(date) | | | | Details |
| S,ly | southerly | | | | Details |
| S.L. | sea level | | | | Details |
| S/L | Slickline | | | | Details |
| S/R B/L | Signing and Releasing Bill(s) of Lading | | | | Details |
| S0NL | Sonic log | | | | Details |
| S7HL | SenTREE 7 Helical Latch | | | | Details |
| S7LC | SenTREE 7 Lubricator Centraliser | | | | Details |
| S7LM | SenTREE 7 Latch Mandrel | | | | Details |
| S7LV | SenTREE 7 Lubricator Valve | | | | Details |
| sadl | saddle | | | | Details |
| Sal | Salado | | | | Details |
| sal | salary, salaried | | | | Details |
| sal | salinity | | | | Details |
| Sal | Bay Saline Bayou | | | | Details |
| SALM | Single Anchor Loading Mooring | | | | Details |
| salv | salvage | | | | Details |
| SAML | Sample Log | | | | Details |
| SASOL | South African Coal, Oil and Gas Corp. Ltd. South Africa | | | | Details |
| SBL | Segment Bond Log | | | | Details |
| SC DL | slip and cut drill time | | | | Details |
| SCAL | Special core analysis | | | | Details |
| SCFIL | Structurally Consistent Filtering | | | | Details |
| Schl. | Schlumberger | | | | Details |
| Schl., | Sj Schlumberger | | | | Details |
| SCHLL | Schlumberger Log also SCHLO, SCHLU | | | | Details |
| Scholle | Block (a compartment of reservoir) Geology, | | | | Details |
| SCL | Strategic Cost Leadership | | | | Details |
| SCL | slickline collar locator | | | | Details |
| SCL | Sonic Caliper | | | | Details |
| SCL | Sonic Caliper Log | | | | Details |
| SCLSS | Slim Compensated Long Spaced Sonic | | | | Details |
| scly | securaloy | | | | Details |
| scolc | scolescodonts | | | | Details |
| SDL | Supplier Document List | | | | Details |
| SDL | Spectral Density Log | | | | Details |
| SDL | shut down to log | | | | Details |
| SDLC | Systems Development Life Cycle | | | | Details |
| sdoilfract | sand-oil fracked | | | | Details |
| SDPL | shut down for pipeline | | | | Details |
| SDWL | sidewall core | | | | Details |
| SDWL | sidewall | | | | Details |
| SEDL | Sedimentology Log | | | | Details |
| sel | selenite | | | | Details |
| Sel | Selma | | | | Details |
| SELECT | selection(tive)(tor) | | | | Details |
| SELFDISCH | SelfDischarger | | | | Details |
| SELV | Safety Extra Low Voltage | | | | Details |
| SEPIL | Shell Exploration and Production, Ireland | | | | Details |
| SFL | Spherically Focused Log | | | | Details |
| SFL | Steel Flying Lead | | | | Details |
| SFL | starting fluid level | | | | Details |
| SFL | Sidewall Frac Log | | | | Details |
| SFL DIL | Dual Induction | | | | Details |
| SFLU | slight, weak, or poor fluorescence | | | | Details |
| sgl(s) | single(s) | | | | Details |
| SHELL | Royal Dutch/Shell Group Netherlands/UK | | | | Details |
| SHELL IS | Shell Internal Standard | | | | Details |
| shld | shoulder | | | | Details |
| shls | shells | | | | Details |
| SHLT | shelter | | | | Details |
| shly | shaley | | | | Details |
| shly | shaly | | | | Details |
| SHOWL | Show Log | | | | Details |
| SIL | Safety Integrity Review (HSE) | | | | Details |
| SIL | Safety Integrity Level | | | | Details |
| Sil | Silurian | | | | Details |
| silc | siliceous | | | | Details |
| silic | silica, siliceous | | | | Details |
| silt | siltstone | | | | Details |
| SIPETROL | Sociedad Internacional Petrolera S.A. Chile | | | | Details |
| SKPLT | Stick Plot Log | | | | Details |
| SL | Seismic Lines | | | | Details |
| SL | Surface Location | | | | Details |
| SL | Spectralog | | | | Details |
| SL | SIERRA LEONE | | | | Details |
| SL | see Slick Line | | | | Details |
| SL | Acoustic or Acoustilog | | | | Details |
| SL | Acoustic Velocity | | | | Details |
| SL | Sonic | | | | Details |
| SL | section line | | | | Details |
| sl | sleeve | | | | Details |
| SL | south line | | | | Details |
| SL | state lease | | | | Details |
| SL | Sonic log | | | | Details |
| SL | Spectralog® | | | | Details |
| SL1 | Slim Line - SL41575 | | | | Details |
| SL2 | Slim Line - SL41576 | | | | Details |
| SL3 | Slim Line - SL41606 | | | | Details |
| SL4 | Slim Line - SL41607 | | | | Details |
| SLA | South Lebanon Army | | | | Details |
| SLA | Service Level Agreements | | | | Details |
| SLAM | A combine: Signal Oil and Gas Co., Louisiana Land & Exploration Co., and Marathon Oil Co. | | | | Details |
| SLB | Schlumberger | | | | Details |
| SLB | SOLOMON ISLANDS | | | | Details |
| SLC | Shell Leadership Challenge | | | | Details |
| SLC | steel line correction | | | | Details |
| SLD | Stabilized Litho Density | | | | Details |
| sld | sealed | | | | Details |
| SLDT | Slimhole Litho-Density | | | | Details |
| SLE | SIERRA LEONE | | | | Details |
| SlGW | shut in gas well | | | | Details |
| sli | slight, slightly | | | | Details |
| sli | slight(ly) | | | | Details |
| Sli | Sligo | | | | Details |
| sli | SO slight show of oil | | | | Details |
| SLIM1 | Slim Hole Retrievable MWD Tool | | | | Details |
| slky | silky | | | | Details |
| SLM | slick line measurement | | | | Details |
| SLM | steel line measurement | | | | Details |
| SLNCR | silencer | | | | Details |
| slnd | solenoid | | | | Details |
| SLPR | sleeper | | | | Details |
| SLPRC | Sierra Leone Petroleum Refining Co. Ltd. Sierra Leone | | | | Details |
| SLPTA | SLop TAnks | | | | Details |
| SLS | SLS GR Log | | | | Details |
| SLS | slimline single-phase reservoir fluid sampler (SLB) | | | | Details |
| SLSR | Schlumberger Electronic Memory Gauge Recorder (Sapphire Type) | | | | Details |
| SLT | Borehole Compensated Sonic Logging Tool | | | | Details |
| SLT | SLT GR Log | | | | Details |
| SLT | Standard Lease Terms | | | | Details |
| Slt | Mtn Salt Mountain | | | | Details |
| SLT | Borehole Compensated Sonic Log | | | | Details |
| SLT | Long-Spacing Sonic Log | | | | Details |
| SLTST | Silt Stone | | | | Details |
| slty | silty | | | | Details |
| Slty | salty | | | | Details |
| SLUR | slurry | | | | Details |
| SLV | Subsea Lubricator Valve | | | | Details |
| SLV | EL SALVADOR | | | | Details |
| slv | sleeve | | | | Details |
| s'lY | southerly | | | | Details |
| SMLS | Seamless Pipe | | | | Details |
| SMLS | Seamless PipeMPP: | | | | Details |
| smls | seamless | | | | Details |
| smpl | sample | | | | Details |
| SNL | Spectral Noise Log | | | | Details |
| Socal | Standard Oil Company of California | | | | Details |
| sol | solenoid | | | | Details |
| sol | solids | | | | Details |
| SOLAS | Safety of Life at Sea | | | | Details |
| soln | solution | | | | Details |
| solv | solvent | | | | Details |
| SOMALGAZ | Societe Mixte Algerienne de Gaz Algeria | | | | Details |
| SONACOL | Sociedad Nacional de Oleoductos Ltda. Chile | | | | Details |
| SONANGOL | Sociedade Nacional de Combustiveis Sonangol Angola | | | | Details |
| SONELGAZ | Societe Nationale d’Electricite et du Gaz Algeria | | | | Details |
| SONL | Sonic | | | | Details |
| SONL | sonic log | | | | Details |
| SONPETROL | Sondeos Petroliferos, S.A. Spain | | | | Details |
| SOTETEL | Société Tunisienne d’Entreprises de Télécommunications | | | | Details |
| SOTRAL | Societe de Transport d’Arzews Algeria | | | | Details |
| SOW_Slip | On Wellhead | | | | Details |
| spcl | special | | | | Details |
| spdl | spindle | | | | Details |
| SPEL | Spectralog | | | | Details |
| sphal | sphalerite | | | | Details |
| spkld | speckled | | | | Details |
| spl | sample | | | | Details |
| spl | cham sample chamber | | | | Details |
| SPL | Shell Pakistan ltd. Pakistan | | | | Details |
| SPL | Saudi Petroleum Ltd. Saudi Arabia | | | | Details |
| spl cham | sample chamber | | | | Details |
| spl top | sample top | | | | Details |
| SPLA | Sudan’s People’s Liberation Army | | | | Details |
| spletp | Spindletop | | | | Details |
| SPLSE | Societe du Pipe-Line Sud Europeen France | | | | Details |
| SPLTR | splitter | | | | Details |
| splty | specialty | | | | Details |
| splty | splintery | | | | Details |
| SPOL | Saudi Petroleum Overseas Ltd. Saudi Arabia | | | | Details |
| SPWLA | Society of Petrophysicists and Well Log Analysts | | | | Details |
| SPWLA | Society of Petroleum Well Log Analysts | | | | Details |
| SPWLA | Society of Professional Well Log Analysts | | | | Details |
| SQL | Siesmic Quicklook Log | | | | Details |
| SQL | Structured Query Language | | | | Details |
| SRL | single random lengths | | | | Details |
| SRPL | Surface Recorded Pressure Log | | | | Details |
| SRSL | Seismic Reference Survey/Neutron | | | | Details |
| SSL | Secure Socket Layer | | | | Details |
| SSLT | Slim Array Sonic Logging Tool | | | | Details |
| SSLV | Sub Sea Lubricator Valve | | | | Details |
| SSPLR | Subsea Pig Launcher/Receiver | | | | Details |
| SSSL | Supplementary Seismic Survey Licence (United Kingdom), a type of onshore licence | | | | Details |
| St L | Saint Louis lime | | | | Details |
| STAATSOLIE | Staatsolie Maatschappij Suriname NV (State Oil Co. Suriname NV) Suriname | | | | Details |
| Stal | Stalnacker | | | | Details |
| STATOIL | Den Norske Stats Oljeselskap AS Norway | | | | Details |
| STEL | Short-term exposure limit (see comment) | | | | Details |
| STEL | Short Term Exposure Limit | | | | Details |
| Stel | Steele | | | | Details |
| STFL | Steel Tube Fly Lead | | | | Details |
| STGL | Stratigraphic Log | | | | Details |
| STL | STL Gamma Ray Log | | | | Details |
| STL | Service The Limit | | | | Details |
| STL | Stock Tank Liquid | | | | Details |
| stl | steel | | | | Details |
| STL | Time Lapse | | | | Details |
| stncl(d)(g) | stencil(ed)(ing) | | | | Details |
| Straddle | Doppel-Packer Anordnung | | | | Details |
| sub angl | subangular | | | | Details |
| sul | sulfur, sul2hur | | | | Details |
| Sul | dk | | | | Details |
| Sul | trpt | | | | Details |
| sul | sulfur | | | | Details |
| sul | wtr sulfur water | | | | Details |
| SULF | sulfur, sulfuric | | | | Details |
| sulf | sulfated | | | | Details |
| SUML | Summarised Log | | | | Details |
| supl | supply(ied)(ier)(ing) | | | | Details |
| SURVL | Survey Chart Log | | | | Details |
| SVLN | slickline Safety Valve Landing Nipple | | | | Details |
| SWL | Safe Working Load | | | | Details |
| SWL | Safe Working Load | | | | Details |
| SWLD | seal weld | | | | Details |
| SYCOPOL | Oil Spill Control Assn. of France France | | | | Details |
| Syl | Sylvan | | | | Details |
| Tal | Tallahatta | | | | Details |
| TAL | Deutsche Transalpine Oelleitung GmbH Germany | | | | Details |
| TAL | AUSTRIA Transalpine Olleitungin Oesterreich GmbH Austria | | | | Details |
| TAML | Technology Advancement of Multi Lateral | | | | Details |
| TAML | Technical Advancement of Multi-Laterals An industry group that has defined multi-lateral junction levels and terminology | | | | Details |
| TAMOIL | Subsidiary of NOC Libya Libya | | | | Details |
| TANSTAAFL | There Ain't No Such Thing As A Free Lunch | | | | Details |
| TAPLI | Tape Listing | | | | Details |
| Tapline | Trans-Arabian Pipeline or Trans-Arabian Pipe Line Company | | | | Details |
| TB/BDL | tube bundle | | | | Details |
| T-Bills | Treasury Bills | | | | Details |
| TCAL | Through-Tubing (X-Y) Caliper Log | | | | Details |
| TCL | Tubing conveyed logging run | | | | Details |
| TDL | Total Depth (wireline depth) | | | | Details |
| TDL | Temperature Difference | | | | Details |
| TDL | Temperature Difference Log | | | | Details |
| Technical | Information Service | | | | Details |
| TEL | tubing end locator | | | | Details |
| tel | telephone, telegraph | | | | Details |
| TEL | tetraethyl lead | | | | Details |
| Tel | Cr Telegraph Creek | | | | Details |
| TELE | Telescope | | | | Details |
| TELER | Teledrift Report | | | | Details |
| TFL | Through Flow Line | | | | Details |
| TFL | through the flow line, a mechanism for well service where the tools are pumped downhole through the flow lines | | | | Details |
| TFLR | TTRM Sub Fluid Resistivity | | | | Details |
| TGLR | total gas lift ratio | | | | Details |
| thin film | Type of epoxy coating for pipeline coating rather than threading or welding | | | | Details |
| THLD | Threshholding | | | | Details |
| thrling | throttling | | | | Details |
| TIFL | tubing integrity fluid level | | | | Details |
| TKL | TOKELAU | | | | Details |
| TL | Twist Lock | | | | Details |
| TL | Total Loss | | | | Details |
| TL | TOKELAU | | | | Details |
| TL | TIMOR-LESTE/EAST TIMOR | | | | Details |
| TL | Timing Limitation | | | | Details |
| tl | tool(s) | | | | Details |
| tl jt | tool joint | | | | Details |
| TL TEMP | Temperature Log | | | | Details |
| TLA | Technical Limit Approach (BP) | | | | Details |
| TLA | Three Letter Acronym | | | | Details |
| TLC | Tough Logging Condition (logging tools will be run on pipe) | | | | Details |
| TLC | Tough Logging Conditions | | | | Details |
| TLD | Three-Detector Lithology Density | | | | Details |
| TLD | Technical Limit Drilling | | | | Details |
| TLE | thread large end | | | | Details |
| TLG | telegraph | | | | Details |
| TLH | top of liner hanger | | | | Details |
| TLI | Top of Logging Interval | | | | Details |
| TLO | Tight Light Oil | | | | Details |
| TLOG | Technical Log | | | | Details |
| TLP | tension leg platform | | | | Details |
| TLROP | Tehnical Limit Rate of Penetration | | | | Details |
| TLS | Tanker Loading Site | | | | Details |
| TLS | TIMOR-LESTE/EAST TIMOR | | | | Details |
| TLS | Timing Limitation Stipulation | | | | Details |
| TLSE | Technical Limit Specific Energy | | | | Details |
| TLV | Threshold Limit Value (see comment) | | | | Details |
| TLV | Threshold Limit Value | | | | Details |
| TMD-L | Thermal Multigate Decay-Lithology | | | | Details |
| TML | tetramethyl lead | | | | Details |
| TMPL | Temperature Survey | | | | Details |
| TMPL | Temperature Survey Log | | | | Details |
| TNL | tubing nipple locator | | | | Details |
| TOEFL | Test for English as a Foreign Language | | | | Details |
| TOL | Top Of Liner | | | | Details |
| tol | tolerance | | | | Details |
| tolu | toluene | | | | Details |
| TOTAL | Total Fina Elf (merger of former CFP, PetroFina, Elf Aquitaine) France | | | | Details |
| TRACL | Tractor Log | | | | Details |
| transl | translucent | | | | Details |
| TRAPIL | Societe des Transports Petroliers Par Pipeline France | | | | Details |
| trilo | trilobite | | | | Details |
| TRL | Technology Readiness Level | | | | Details |
| TRL | Tracer Log | | | | Details |
| TRL | Tracerlog | | | | Details |
| TRL/NEU | Tracer Log-Neutron | | | | Details |
| TRVL | travel(ed)(ing) | | | | Details |
| TSE-WLE | thread small end, weld large end | | | | Details |
| TSL | Tubing Stability Latch (Completion zone) | | | | Details |
| TTL | ToTaL | | | | Details |
| TTL | Transistor-Transistor Logic | | | | Details |
| TTL | total time lost | | | | Details |
| Tul | Cr Tulip Creek | | | | Details |
| TVDBSL | True Vertical Depth Below Sea Level | | | | Details |
| TVELD | Time and Velocity to Depth | | | | Details |
| TWTTL | Two-Way Travel Time Log | | | | Details |
| U/L | upper and lower | | | | Details |
| UBL | United Bank of Lebanon | | | | Details |
| UEL | Upper Explosive Limit (highest level of gas in air which will explode upon ignition. Above UEL, the mixture is too rich to burn - No O2 enough) | | | | Details |
| UELN | United European Levelling Net | | | | Details |
| UGL | universal gear lubricant | | | | Details |
| ULC | Underwriters Laboratory of Canada (see comment) | | | | Details |
| ULCC | Ultra Large Crude Carrier | | | | Details |
| ULCC | Ultra Large Crude Carriers | | | | Details |
| ULCC | ultra-large crude carrier | | | | Details |
| ULCGR | Uncompressed LDC CNL Gamma Ray Log | | | | Details |
| ULJ | perforating, Ultrajet | | | | Details |
| ULNB | ultra low NOX burner (high fraction staged fuel) | | | | Details |
| ULSD | Ultra-low sulfur diesel | | | | Details |
| ULSE | Ultralong Spacing Electric Log | | | | Details |
| ULSE | Ultra 2.M. Spacing | | | | Details |
| ULSEL | Ultralong Spacing Electric Log | | | | Details |
| ult | ultimate | | | | Details |
| ULW | Ultra Light Weight (Proppant) | | | | Details |
| UNBAL | unbalanced | | | | Details |
| unconsol | unconsolidated | | | | Details |
| UNLD | unloading | | | | Details |
| UNLDR | unloader | | | | Details |
| UNOCAL | Union Oil of California | | | | Details |
| URL | uniform resource locator | | | | Details |
| USIL | United Safety International Limited | | | | Details |
| UTL | utility | | | | Details |
| UWILD | Underwater Inspection in Lieu of Dry Docking | | | | Details |
| V/L | vapor-liquid ratio | | | | Details |
| Val | Valera | | | | Details |
| Valve | any of several valves | | | | Details |
| Vcl | clay Volume | | | | Details |
| VDENL | Variation Density Log | | | | Details |
| VDL | Variable Density Log | | | | Details |
| VDL | VDL Log (Variable Density Log) | | | | Details |
| VDL | Variable Deck Load (floating rig) | | | | Details |
| vel | velocity | | | | Details |
| VEL | Velocity | | | | Details |
| VELA | Vela International Marine Ltd. Saudi Arabia | | | | Details |
| VELL | Velocity Log | | | | Details |
| VELS | Velocity | | | | Details |
| VERLI | Verification Listing | | | | Details |
| VITOL | Vitol and global subsidaries Netherlands | | | | Details |
| VL1 | Vertiline 3-1/2 in. (89 mm, 4-1/2 in. (114mm) | | | | Details |
| VL2 | Vertiline 5-1/2 in. (140 mm) | | | | Details |
| VL3 | Vertiline 7 in. (178 mm) | | | | Details |
| VL4 | Vertiline 8-5/8 in. (219 mm) | | | | Details |
| VLA | Vertical Loaded Anchors | | | | Details |
| VLAC | very light amber cut | | | | Details |
| VLCC | Very Large Crude Carrier | | | | Details |
| VLCC | Very Large Crude Carriers | | | | Details |
| VLP | Vertical Lift Performance | | | | Details |
| VLRC | Virtual Learning Reality Center | | | | Details |
| VLS | Vertical Lay System | | | | Details |
| VLTCS | Very Low Temperature Carbon Steel | | | | Details |
| VLV | valve | | | | Details |
| VOL | Volume | | | | Details |
| vol% | volume-percent | | | | Details |
| vol. | eff. volumetric efficiency | | | | Details |
| VOLT | voltage | | | | Details |
| vrtl | vertical | | | | Details |
| VSL | VeSseL | | | | Details |
| v-sli | very slight, slightly | | | | Details |
| v-sli | very slight | | | | Details |
| VTDLL | Vertical Thickness Dual Laterolog | | | | Details |
| VTLN | Vertiline | | | | Details |
| VWL | Velocity Well Log | | | | Details |
| W/CLR | water cooler | | | | Details |
| W/L | Wireline logging | | | | Details |
| W/L | Wireline | | | | Details |
| W/L | Water Load | | | | Details |
| W/sulf O | water with sulfur odor | | | | Details |
| W’ly | westerly | | | | Details |
| WALKS | Walkaway Seismic Profile | | | | Details |
| WALS | Western Atlas Logging Servises | | | | Details |
| WDL | Work Days Lost | | | | Details |
| WDL | Well Delivery Limit | | | | Details |
| WDL | Well Deliverability Limit | | | | Details |
| WDLR | Work Days Lost Restricted | | | | Details |
| WELDA | Well Data Report | | | | Details |
| Well | Wellington | | | | Details |
| WELP | Well Log Plot | | | | Details |
| WEQL | Well Equipment Layout | | | | Details |
| WestLB | Westdeutsche Landesbank Girozentrale | | | | Details |
| WFL | Water Flow Log | | | | Details |
| WHL | wheel | | | | Details |
| whsle | wholesale | | | | Details |
| Willb | Willberne | | | | Details |
| WITSML | Well Information Transfer Standard Markup Language | | | | Details |
| WL | Water Level | | | | Details |
| WL | Water Line | | | | Details |
| WL | Wireline | | | | Details |
| WL | Wat er locat ion Survey | | | | Details |
| Wl | washing in | | | | Details |
| Wl | wrought iron | | | | Details |
| WL | water loss | | | | Details |
| WL | well lines | | | | Details |
| WL | west line | | | | Details |
| WL | Wireline | | | | Details |
| wlbr | wellbore | | | | Details |
| WLC | Wireline Composite Log | | | | Details |
| WLC | Wireline core | | | | Details |
| WLC | wireline coring | | | | Details |
| wld | welded, welding | | | | Details |
| WLD/DET | welding detail(s) | | | | Details |
| wldr | welder | | | | Details |
| WLDS | WellLink Data Services (Baker Hughes online web based data transfer tool) | | | | Details |
| WLEG | Wire Line Entry Guide (Probably this is mule shoe) | | | | Details |
| WLEG | Wireline Entry Guide | | | | Details |
| WLF | WALLIS AND FUTUNA ISLANDS | | | | Details |
| WLGDP | West Libya Gas Development Project | | | | Details |
| WLI | Well Log Interpretation | | | | Details |
| WLL | Wireline Logging | | | | Details |
| WLM | wireline measurement | | | | Details |
| WLMD | wireline measured depth | | | | Details |
| WLMS | Well Log Management System | | | | Details |
| WLR | Water Level Recorder | | | | Details |
| WLR | WireLine Run | | | | Details |
| WLR | Water Liquid Ratio (water cut in an oil well ) | | | | Details |
| WLS | Water Lift Station | | | | Details |
| WLS | Water Location Survey | | | | Details |
| WLSUM | Well Summary | | | | Details |
| WLT | Wireline test | | | | Details |
| WLTD | wireline total depth | | | | Details |
| WLTOHC | WaterLine-TO-HatchCoaming (distance) | | | | Details |
| WLTS | Well Log Tracking System | | | | Details |
| WLTS | Well Log Transaction System | | | | Details |
| W'ly | westerly | | | | Details |
| Wolfc | Wolfcamp | | | | Details |
| WOPL | waiting on pipe line | | | | Details |
| WOPL | waiting on pipeline | | | | Details |
| WPLAN | Well Course Plan | | | | Details |
| WQFL | Well Quality Feedback Loop | | | | Details |
| WSCL | Well Site Core Log | | | | Details |
| WSL | Well Site Log | | | | Details |
| WSL | Well Site Leader | | | | Details |
| WSTL | Well Site Test Log | | | | Details |
| WWL | Wire Wrapped Liner | | | | Details |
| XGL | GLORIOSO ISLANDS | | | | Details |
| XL | or EXL, Exploration Licence (United Kingdom), | | | | Details |
| XL | or EXL, Exploration Licence (United Kingdom), a type of onshore licence issued between the First Onshore Licensing Round (1986) and the Sixth (1992) | | | | Details |
| XL | PALMYRA ATOLL | | | | Details |
| Xlam | cross-laminated | | | | Details |
| X-line | extreme line | | | | Details |
| Xln | Crystalline (minerals) | | | | Details |
| Xln | crystalline | | | | Details |
| XLOT | Extended Leak Off Test | Same as ELOT | | | Details |
| XLPE | Cross-linked Polyethylene | | | | Details |
| XLS | Extra Low Swell | | | | Details |
| XNL | XN (nipple) locator | | | | Details |
| XPHLOC | Crossplot Selection for XPHI | | | | Details |
| XPL | PALMYRA ATOLL | | | | Details |
| XPLL | Experimental | | | | Details |
| XPTL | Experimental | | | | Details |
| xtal | crystal | | | | Details |
| XYCL | X-Y Caliper | | | | Details |
| xyln | crystaline or crystal | | | | Details |
| yel | yellow | | | | Details |
| YIL | yellow indicating lamp | | | | Details |
| yl | Holdup Factor | | | | Details |
| yllw | yellow | | | | Details |
| YLNG | Yemen Liquefied Gas Company | | | | Details |
| YLNGC | Yemen Liquefied Natural Gas Company | | | | Details |
| Z list | OSHA list of hazardous chemicals (29 CFR 1910 Subpart Z, Worker Right-To-Know) | | | | Details |
| ZDL | Compensated Z-Densilog | | | | Details |
| ZDL | Compensated Z-DensilogSM | | | | Details |
| Zil | Zilpha | | | | Details |
| ZnCl2 | zinc chloride | | | | Details |
| PLS | Prozessleitsystem | | | | Details |
| FL/EC | Flux Leakage/Eddy Current tool | | | | Details |
| CrystalSeal | See PGS | | | | Details |
| LTIR | Lost Time Injury Rate | | | | Details |
| LTIR | Lost Time Incident Rate | | | | Details |
| LTIR | Long-Term Injured Reserve (professional sports) | | | | Details |
| LTIR | Longer Term Investment Return | | | | Details |
| LP | Linear Planning | | | | Details |
| LP | Loading Point | | | | Details |
| Vented plug | See Comment | | | | Details |
| LWDI | Lost Work-day Injury | | | | Details |
| LOPC | Loss of Primary Containment | | | | Details |
| WLS | Wireline Set tool | | | | Details |
| LKPI | Local Key Performance Indicator | | | | Details |
| LKPI | Logistics Key Performance Indicator | | | | Details |
| GHL | Gesamt Haken Last | | | | Details |
| ÜL | Über Last | Overpull of sreing | | | Details |
| LKW | Lastkraftwagen | | | | Details |
| Clu | Sondencluster | well cluster | | | Details |
| Ltg | Gasleitung | pipeline | | | Details |
| LÖSST | Lebenölsammelstation | Oil gathering station | | | Details |
| LOESST | Lebenölsammelstation | Oil gathering station | | | Details |
| LÖMST | Lebenölmessstation | Oil measuring station | | | Details |
| LOEMST | Lebenölmessstation | Oil measuring station | | | Details |
| SL | Premium small diameter bits | | | | Details |
| DL | Diamond Lug Pads | | | | Details |
| EGL | Elevation, Ground Level | | | | Details |
| TDL | Total Depth-Logger | | | | Details |
| CBL | Casing Bottom Logger | | | | Details |
| TLI | Top Logged Interval | | | | Details |
| BLI | Bottom Logged Interval | | | | Details |
| DFL | Drilling Fluid Loss | | | | Details |
| LMF | Logging Measured From | | | | Details |
| TLAB | Time Logger at Bottom | | | | Details |
| LCC | Logging Company Code | | | | Details |
| LUL | Equiptment Location | | | | Details |
| STTBl | Stability Time Before Log | | | | Details |
| HRLB | Hours Log began | | | | Details |
| LOGDIR | Logging Direction Up or Down | | | | Details |
| LSN | long- and short-normal resistivity | | | | Details |
| LSN | long-spaced gamma-ray detector | | | | Details |
| LSO | Low Sulphur Oil | | | | Details |
| SL | Sluted Liner | | | | Details |
| LTM | Leadership Team Meeting | | | | Details |
| SL | Slope | | | | Details |
| FLV | Flapper Valve (sometime used instead of SSSV or UTSV) | | | | Details |
| FL | Flapper | | | | Details |
| LKK | linearer Korrelationskoeffizient (als Maß für die Exaktheit des lineraren Zusammenhanges). | | | | Details |
| LRK | linearer Regression koeffizient (same as LKK) | | | | Details |
| BS_L | Stunden für laufende Behandlung [h] | | | | Details |
| AWL | Above Water Level | | | | Details |
| UFL | Upper Flammability Limit | | | | Details |
| LFL | Lower Flammability Limit | | | | Details |
| FL | Flammability Limit | | | | Details |
| EL | Explosive Limit | | | | Details |
| BLEVE | Boiling liquid expanding vapor explosion | | | | Details |
| LV | Lebensversicherung | | | | Details |
| NL | No well log | | | | Details |
| LAS | Log ASCII Standard (a kind of ascii file used in petroleum industry) | | | | Details |
| Abwältigung | In a well when it is needed to change the producing interval back to a deeper interval; needs isolation of upper perfs etc. | | | | Details |
| Aufwältigung | In a well when it is needed to change the producing interval to a shallower interval | | | | Details |
| WL | Well Location | | | | Details |
| VLS | Volume of Limestone | | | | Details |
| VDOL | Volume of Dolomite | | | | Details |
| rel | relative | | | | Details |
| LIS | Log Information Standard | | | | Details |
| DLIS | Digital Log Information Standard | | | | Details |
| ULF | Ultra-low frequency | | | | Details |
| HLA | high side - lateral - along hole | | | | Details |
| SOL | Süd Ost Leitung | | | | Details |
| LQCRM | Log Quality Control Reference Manual | | | | Details |
| ILT | Instructor-Led Training | | | | Details |
| LRP | Linear Rod Pump | | | | Details |
| mtl | Monatlich | | | | Details |
| LFY | Last Fiscal Year | | | | Details |
| VLA | Vertical Last Anchor | | | | Details |
| CLL | Cluster Lead | | | | Details |
| TGL | Toll Gate Light | | | | Details |
| SLP | Sea Level Pressure | | | | Details |
| SFL | Static Fluid Level | | | | Details |
| DFL | Dynamic Fluid Level | | | | Details |
| FL | Fluid Level | | | | Details |
| LOWIS | Life Of Well Information Software | | | | Details |
| PL | Lagerstätte Pressure | Reservoir pressure | | | Details |
| LTS | Long-Term Strategy | | | | Details |
| LOT | Load On Top | | | | Details |
| VLR | Vessel Load Ration | | | | Details |
| FL | Filling level | | | | Details |
| ALL | Albanian Lek | | | | Details |
| BRL | Brazilian Real | | | | Details |
| CLP | Chilean Peso | | | | Details |
| GEL | Georgian Lari | | | | Details |
| HNL | Honduran Lempira | | | | Details |
| ILS | Israeli New Shekel | | | | Details |
| LAK | Lao Kip | | | | Details |
| LVL | Latvian Lats | | | | Details |
| LBP | Lebanese Pound | | | | Details |
| LSL | Lesotho Loti | | | | Details |
| LRD | Liberian Dollar | | | | Details |
| LYD | Libyan Dinar | | | | Details |
| LTL | Lithuanian Litas | | | | Details |
| MDL | Moldovan Leu | | | | Details |
| PLN | Polish Zloty | | | | Details |
| SLL | Sierra Leone Leone | | | | Details |
| LKR | Sri Lanka Rupee | | | | Details |
| SZL | Swaziland Lilangeni | | | | Details |
| Cl | Clay | | | | Details |
| verl | verloren | lost | | | Details |
| RCL | Resistivity of Clay | | | | Details |
| VCL | volume of clay | | | | Details |
| PHICL | clay corrected porosity | | | | Details |
| RHOBCL | bulk density of clay | | | | Details |
| VSILT | volume of silt | | | | Details |
| rl | Reference Log | | | | Details |
| ZUFL | Zufluß | medium, effluent | | | Details |
| SL | Schlitzliner | Slotted Liner | | | Details |
| GLB | A kind of PCP pump | | | | Details |
| TDL | To Do List | | | | Details |
| ECL | Exploration Consultants Limited | | | | Details |
| OILP | Oil Producer | | | | Details |
| cnl | Contour | | | | Details |
| dly | Daily Data | | | | Details |
| flt | Fault Data | | | | Details |
| hly | Hourly Data | | | | Details |
| il | Info Line | | | | Details |
| las | LAS Log Format | | | | Details |
| lgv | Log File | | | | Details |
| lku | Lookup Data | | | | Details |
| loc | Location | | | | Details |
| log | Trace data | | | | Details |
| mwl | Multi-Well Log | | | | Details |
| ENL | Entnahmeleistung | Production performance | | | Details |
| EPL | Einpressleistung | Injecting performance | | | Details |
| LTEN | Wireline Tension | | | | Details |
| MLT | Memory Logging Tool | | | | Details |
| LAH | Logging Adapter Head | | | | Details |
| PL | Production Logging | | | | Details |
| ILF | In-Line Flowmeter | | | | Details |
| LAH | Logging Adapter Head | | | | Details |
| PPL | Pocket Production Logging | | | | Details |
| LRMC | Long Run Marginal Cost | | | | Details |
| GLZ | Gleitzeit | Flexitime | | | Details |
| LA | Laufende | ongoing operation or may refer to well intervention | | | Details |
| LG | Lift Gas | Lifting Gas | | | Details |
| mbbl | Million Barrels | | | | Details |
| VGL | Vergleichen | to compare | | | Details |
| LFA | Laufende | ongoing operation or may refer to well intervention | | | Details |
| Bleiabdruck | Impression Block | Impression Block | | | Details |
| MLD | Mengen, Leistung, Dokumentation | Measurements, performance, documents | | | Details |
| RGL | Rohr- und Gerätelager | Tubular and tools warehouse | | | Details |
| LA | Laufende Behandlungen | Well Intervention | | | Details |
| LAE | Laufende Behandlungen Energize | Well Intervention - specifically looked for other potentials | | | Details |
| LI | Liquidationen | Plug & Abandon the well | | | Details |
| MLT | Multi Logging Tool | | | | Details |
| SL | Stream Line | | | | Details |
| 3DSL | 3 Dimentional Stream Line | | | | Details |
| HSLA | High Strength Low Alloy | | | | Details |
| LCF | low cycle fatigue | | | | Details |
| MFL | Magnetic Flux Leakage | | | | Details |
| Pegel | Level | Level | | | Details |
| TLW | Teilweise | Partly | | | Details |
| LLdyn | Liquid Level dynamic | | | | Details |
| LLstat | Liquid Level Static | | | | Details |
| KRL | Konzern Richtlinien | Corporate Standard | | | Details |
| Gewinnungsfeld | License to produce | | | | Details |
| Grubenfeld | License to produce (During and before WWII, no production tax applicable) | | | | Details |
| LTC | Long Thread Coupling | | | | Details |
| CL | Casing Leck | Casing Leak | | | Details |
| Überlauf | overflowing | Over flowing | | | Details |
| VTL | Versa Trieve packer | Halliburton Production packer | | | Details |
| DEPL | Depleted | | | | Details |
| Tongehalt | Clay content | | | | Details |
| Rat hole | In the context of a drilling rig, a rat hole is the hole through the rig floor where the kelly can be stored when it has to be disconnected | | | | Details |
| Rat hole | In the context of a well, a rat hole is the hole below the pay zone. Commonly drilled to drop off perforating guns of a gathering or sump area for liquids to separate from gas prior to being pumped. | | | | Details |
| Sackloch | Rat hole | | | | Details |
| VLI | Vintage Log Interpretation | | | | Details |
| FLL | Falling Liquid Level | | | | Details |
| WFL | Water Flooding | | | | Details |
| ILS | Improved Lateral Sweep | | | | Details |
| BOCL | a kind of a weight set packer | | | | Details |
| A-Öl | Asphaltierte Öl | Asphaltinic Oil | | | Details |
| A-Oil | Asphaltic Oil | | | | Details |
| A Öl | Asphaltierte Öl | Asphaltinic Oil | | | Details |
| A Oil | Asphaltic Oil | | | | Details |
| P-Öl | Paraffin Öl | Paraphinic Oil | | | Details |
| P-Oil | Paraphinic Oil | | | | Details |
| P Öl | Paraffin Öl | Paraphinic Oil | | | Details |
| P Oil | Paraphinic Oil | | | | Details |
| BSL | Behandlungsstunden Laufend | Well inetvention lost hours | | | Details |
| CPLB | Constant Pressure Lower Boundary | | | | Details |
| $/gal | U.S. dollars per gallon | U.S. dollars per gallon | Dollar pro Gallone | dollars US par gallon | Details |
| $/lb | U.S. dollars per pound | U.S. dollars per pound | Dollar pro Pfund | dollars US par livre | Details |
| µg/L | micrograms per liter | micrograms per liter | Mikrogramm pro Liter | microgrammes par litre | Details |
| 2CAL | 2-Arm Caliper Log | 2-Arm Caliper Log | 2-Arm-Schieber-Log | 2-Arm Caliper Log | Details |
| 2LoT | 2nd Law of Thermodynamics | 2nd Law of Thermodynamics | 2. Hauptsatz der Thermodynamik | 2ème loi de la thermodynamique | Details |
| 3CAL | 3-Arm Caliper Log | 3-arm Caliper Log | 3-Arm Caliper Log | 3-bras Caliper Connexion | Details |
| 4CAL | 4-Arm Caliper Log | 4-Arm Caliper Log | 4-Arm Caliper Log | 4-Arm Caliper Log | Details |
| A CHL | Atlantic Chlorinlog | Atlantic Chlorinlog | Atlantic Chlorinlog | Chlorinlog Atlantique | Details |
| A/CLD | air cooled | air cooled | luftgekühlt | air conditionné | Details |
| A/CLR | air cooler | air cooler | Klimaanlage | refroidisseur d'air | Details |
| AAL | Acoustic Amplitude | Acoustic amplitude | Akustische Amplitude | amplitude acoustique | Details |
| AAPL | American Association of Petroleum Landmen | American Association of Petroleum landmen | American Association of Petroleum landmen | American Association of Petroleum agents fonciers | Details |
| AAPL | American Association of Professional Landmen | American Association of Professional landmen | American Association of Professional landmen | American Association of Professional agents fonciers | Details |
| abd loc | abandoned location | abandoned location | verlassenen Standort | emplacement abandonné | Details |
| ABHL | absolute bottom hole location | absolute bottom hole location | absolute untere Loch Lage | emplacement absolu de fond de trou | Details |
| ABHL | absolute bottom-hole location | absolute bottom-hole location | absolute Lochboden- Lage | emplacement absolu du fond de puits | Details |
| TVDGL | True Vertical Depth referenced to Ground Level | | | | Details |
| MDGL | Measured Depth referenced to Ground Level | | | | Details |
| DFELAT | Drill Floor Elevation referenced to Lowest Astronominal Tide | | | | Details |
| TVDLAT | True Vertical Depth referenced to Lowest Astronominal Tide | | | | Details |
| MDLAT | Measured Depth referenced to Lowest Astronominal Tide | | | | Details |
| ASL | Above Sea Level | | | | Details |
| MDMSL | Measured Depth referenced to Mean Sea Level | | | | Details |
| TVDMSL | True Vertical Depth referenced to Mean Sea Level | | | | Details |
| x-LOT | Extended Leak Off Test | | | | Details |
| xLOTS | Extended Leak Off Tests | | | | Details |
| mglg | Mit ganz lieben Grüßen | With very lovely greetings | | | Details |
| LTIP | Long Term Incentive Plan | | | | Details |
| LS | LagerStätte | Reservoir | | | Details |
| FGL | Förder Gas Leitung | Gas Production Pipeline | | | Details |
| FGL | Fern Gas Leitung | Remote Gas Production Pipeline | | | Details |
| PFGL | Druck in Förder Gas Leitung | Pressure in Gas Production Pipeline | | | Details |
| PFGL | Druck in Fern Gas Leitung | Pressure in Remote Gas Production Pipeline | | | Details |
| P FGL | Druck in Förder Gas Leitung | Pressure in Gas Production Pipeline | | | Details |
| P FGL | Druck in Fern Gas Leitung | Pressure in Remote Gas Production Pipeline | | | Details |
| BULI | Bulimina (teil von Baden) (Geological formation in Austria) | Part of Baden Fm in Austria | | | Details |
| ADKL | Aderklaa (Geological formation in Austria) | | | | Details |
| ADKLKG | Aderklaa konglomerat (Geological formation in Austria) | Aderklaa Conglomerate | | | Details |
| ADKL.KG | Aderklaa konglomerat (Geological formation in Austria) | Aderklaa Conglomerate | | | Details |
| ADKLS | Aderklaa Schichten (Geological formation in Austria) | Aderklaa bedding | | | Details |
| ADKL.S | Aderklaa Schichten (Geological formation in Austria) | Aderklaa bedding | | | Details |
| AGL | Above Ground Level | | | | Details |
| DTL | Drilling Time Log | | | | Details |
| TL | Time Log | | | | Details |
| PTIL | Petroleum Safety Authority in Norway | | | | Details |
| Molch | pig | scraper, go-devil | | | Details |
| Molchschleuse | Scraper trap | | | | Details |
| LTR | Long Term Rating | | | | Details |
| LTF | Superposition Log Time Factor | | | | Details |
| hlb | Halliburton | | | | Details |
| DLCs | Direct Line Compensators | | | | Details |
| DLC | Direct Line Compensator | | | | Details |
| DSL | Drilling Section Leader | | | | Details |
| ELOT | Extended Leak Off Test | Same as XLOT | | | Details |
| LOP | Leak Off Pressure | | | | Details |
| LOP | Leak Of Point | | | | Details |
| PDL | Pressure Dependent Leakoff | | | | Details |
| LT | Limit Test | Same as FIT | | | Details |
| SLD | Static Limit Diagram | | | | Details |
| DLD | Dynamic Limit Diagram | | | | Details |
| PLI | Production Log Interpretation | | | | Details |
| Steigleitung | stand pipe on drilling rig, or Tubing in a well | Stand pipe or tubing | | | Details |
| MBSL | Meter Below See Level | | | | Details |
| MBSL | Meters Below See Level | | | | Details |
| EOL | End Of Lifetime | | | | Details |
| Schlucksonde | Schluckbohrung | Disposal well, | | | Details |
| LGO | Light Gas Oil | | | | Details |
| SIL | Subsea Intervention Lubricator | | | | Details |
| Schleuse | Lubricator for running | | | | Details |
| PLMV | Production lower master valve | | | | Details |
| TLRF | Technical Limit Recovery Factor | | | | Details |
| pcl | pipe conveyed logging | | | | Details |
| LKHC | Lowest-Known Hydrocarbons | | | | Details |
| LP | Last Production | | | | Details |
| LTG | Low tension gas flooding | | | | Details |
| bbl/d.psi | GeoFrame legacy unit | | | | Details |
| (bbl/d)/(c/s) | (barrel per day) per (cycle per second) | | | | Details |
| (bbl/d)/(rev/s) | GeoFrame legacy unit | | | | Details |
| bbl/ft3 | barrel per thousand cubic feet | | | | Details |
| gal/gal | gallon per thousand gallons | | | | Details |
| lbm/gal | pound per thousand gallons | | | | Details |
| gal/ft2 | gallon per hundred square feet | | | | Details |
| lbf/ft2 | pound per hundred square feet | | | | Details |
| lbm/ft2 | pound per hundred square feet | | | | Details |
| 1/lbf | inverse pound force | | | | Details |
| 1/lbm | inverse pound | | | | Details |
| bbl.s/(d.c) | (barrel per day) per (cycle per second) | | | | Details |
| bbl/(acre.ft) | barrel per acre per foot | | | | Details |
| bbl/(d.ft) | barrel per day per foot | | | | Details |
| bbl/(d.ft.psi) | barrel per day per foot per (pound per square inch) | | | | Details |
| bbl/(d.kPa) | barrel per day per kilopascal | | | | Details |
| bbl/(d.psi) | barrel per day per (pound per square inch) | | | | Details |
| bbl/acre | barrel per acre | | | | Details |
| bbl/acre.ft | GeoFrame legacy unit | | | | Details |
| BBL/BBL | barrel per barrel | | | | Details |
| bbl/bbl | barrel per barrel | | | | Details |
| BBL/D | barrel per day | | | | Details |
| bbl/d | barrel per day | | | | Details |
| bbl/d.ft | GeoFrame legacy unit | | | | Details |
| bbl/d.ft.psi | GeoFrame legacy unit | | | | Details |
| bbl/d.kPa | GeoFrame legacy unit | | | | Details |
| bbl/ft3 | barrel per cubic foot | | | | Details |
| bbl/h | barrel per hour | | | | Details |
| BBL/HR | barrel per hour | | | | Details |
| bbl/kPa | barrel per kilopascal | | | | Details |
| bbl/Mft3 | GeoFrame legacy unit | | | | Details |
| bbl/min | barrel per minute | | | | Details |
| BBL/PSI | barrel per (pound per square inch) | | | | Details |
| bbl/psi | barrel per (pound per square inch) | | | | Details |
| bbl/SCF | barrel per standard cubic foot | | | | Details |
| bbl/STB | barrel per standard barrel | | | | Details |
| BBLM | barrel per minute | | | | Details |
| BGL | Bulgarian lev | | | | Details |
| CAL | calorie (international) | | | | Details |
| cal | calorie (international) | | | | Details |
| d/bbl | day per barrel | | | | Details |
| FLB | foot-pound mass | | | | Details |
| FLBF | foot-pound force | | | | Details |
| ft.lbf | foot-pound force | | | | Details |
| ft.lbm | foot-pound mass | | | | Details |
| ft/lbm | foot per pound mass | | | | Details |
| FT3/BBL | cubic foot per barrel | | | | Details |
| ft3/bbl | cubic foot per barrel | | | | Details |
| ftCla | foot (Clarke) | | | | Details |
| ftGoldCoast | Foot (Gold Coast) | | | | Details |
| ft-lbs | foot-pound force | | | | Details |
| G/L | gram per liter | | | | Details |
| g/L | gram per liter | | | | Details |
| G/LB | gallon per pound | | | | Details |
| Gal | galileo | | | | Details |
| GAL | gallon | | | | Details |
| gal/ft | gallon per foot | | | | Details |
| gal/lbm | gallon per pound | | | | Details |
| gal/min | gallon per minute | | | | Details |
| GALLON | gallon (U.S.) | | | | Details |
| galUK | gallon (U.K.) | | | | Details |
| galUS | gallon (U.S.) | | | | Details |
| GKGL | gallon per thousand gallons | | | | Details |
| GL | galileo | | | | Details |
| hL | hectoliter | | | | Details |
| ILS | Israeli shekel | | | | Details |
| in.lbf | inch-pound force | | | | Details |
| ITL | Italian lira | | | | Details |
| kbbl/d | GeoFrame legacy unit | | | | Details |
| kbbl/d.ft | GeoFrame legacy unit | | | | Details |
| kcal/(h.degC.m2) | kilocalorie per hour per degree celsius per square meter | | | | Details |
| kcal/h.oC.m2 | GeoFrame legacy unit | | | | Details |
| KFLB | thousand foot-pound force | | | | Details |
| KG/L | kilogram per liter | | | | Details |
| kg/L | kilogram per liter | | | | Details |
| KILOGRAM | kilogram | | | | Details |
| KILOGRAMS | kilogram | | | | Details |
| KILOMETER | kilometer | | | | Details |
| KILOMETERS | kilometer | | | | Details |
| KILOMETRE | kilometer | | | | Details |
| KILOMETRES | kilometer | | | | Details |
| KLB | thousand pounds mass | | | | Details |
| KLBF | thousand pounds force | | | | Details |
| KLBI | thousand pounds mass per inch | | | | Details |
| klbs | thousand pounds force | | | | Details |
| klx | kilolux | | | | Details |
| KMLM | kilomole per cubic meter | | | | Details |
| kmol | kilomole | | | | Details |
| KMOL/M3 | kilomole per cubic meter | | | | Details |
| kmol/m3 | kilomole per cubic meter | | | | Details |
| L/bar | liter per bar | | | | Details |
| L/BR | liter per bar | | | | Details |
| L/F2 | pound per square foot | | | | Details |
| L/F3 | pound per cubic foot | | | | Details |
| L/h | liter per hour | | | | Details |
| L/kg | liter per kilogram | | | | Details |
| L/KG | liter per kilogram | | | | Details |
| L/m3 | liter per cubic meter | | | | Details |
| L/M3 | liter per cubic meter | | | | Details |
| L/min | liter per minute | | | | Details |
| L/S | liter per stroke | | | | Details |
| LAK | Lao kip | | | | Details |
| LB | pound mass (avoirdupois) | | | | Details |
| LB/D | pound mass per day | | | | Details |
| LB/F | pound mass per foot | | | | Details |
| lb/ft | pound mass per foot (GeoFrame legacy unit) | | | | Details |
| lb/ft3 | GeoFrame legacy unit | | | | Details |
| LB/G | pound per gallon | | | | Details |
| LB/M | pound per minute | | | | Details |
| lb/U.S.gal | GeoFrame legacy unit | | | | Details |
| LB-1 | inverse pound | | | | Details |
| LBF | pound force | | | | Details |
| lbf | pound force | | | | Details |
| lbf.ft | GeoFrame legacy unit | | | | Details |
| lbf.s/ft2 | pound-second per square foot | | | | Details |
| lbf/100ft2 | pound per hundred square feet | | | | Details |
| lbf/lbf | pound force per pound force | | | | Details |
| lbf-1 | GeoFrame legacy unit | | | | Details |
| LBLB | pound force per pound force | | | | Details |
| lbm | pound mass (avoirdupois) | | | | Details |
| lbm.ft | GeoFrame legacy unit | | | | Details |
| lbm/(ft.a) | pound mass per foot per year | | | | Details |
| lbm/(ft.s) | pound mass per foot per second | | | | Details |
| lbm/(ft2.a) | pound mass per square foot per year | | | | Details |
| lbm/(ft2.s) | pound mass per square foot per second | | | | Details |
| lbm/bbl | pound per barrel | | | | Details |
| lbm/d | pound mass per day | | | | Details |
| LBM/FT | pound mass per foot | | | | Details |
| lbm/ft | pound mass per foot | | | | Details |
| lbm/ft2 | pound per square foot | | | | Details |
| lbm/ft3 | pound per cubic foot | | | | Details |
| lbm/gal | pound per gallon | | | | Details |
| lbm/min | pound per minute | | | | Details |
| lbm-1 | GeoFrame legacy unit | | | | Details |
| LBPM | pound mass per meter | | | | Details |
| LCF2 | pound per hundred square feet | | | | Details |
| LF2Y | pound mass per square foot per year | | | | Details |
| LFY | pound mass per foot per year | | | | Details |
| linkClarke | Link (Clarke) | | | | Details |
| LITER | liter | | | | Details |
| LITERS | liter | | | | Details |
| LITRE | liter | | | | Details |
| LKGL | pound per thousand gallons | | | | Details |
| LKR | Sri Lanka rupee | | | | Details |
| LM | lumen | | | | Details |
| lm | lumen | | | | Details |
| LSF2 | pound-second per square foot | | | | Details |
| LSL | Lesothoan loti | | | | Details |
| LTON | U.K. long ton | | | | Details |
| LUF | Luxembourg franc | | | | Details |
| LX | lux | | | | Details |
| lx | lux | | | | Details |
| mg/L | milligram per liter | | | | Details |
| mGal | milligal | | | | Details |
| MGL | milligal | | | | Details |
| MILE | mile | | | | Details |
| MILES | mile | | | | Details |
| MILLIDARCY | millidarcy | | | | Details |
| MILLIGRAM | milligram | | | | Details |
| MILLILITER | milliliter | | | | Details |
| MILLILITERS | milliliter | | | | Details |
| MILLILITRE | milliliter | | | | Details |
| MILLILITRES | milliliter | | | | Details |
| MILLIMETER | millimeter | | | | Details |
| MILLIMETERS | millimeter | | | | Details |
| MILLIMETRE | millimeter | | | | Details |
| MILLIMETRES | millimeter | | | | Details |
| MILLISECOND | millisecond | | | | Details |
| MILLISECONDS | millisecond | | | | Details |
| ML | milliliter | | | | Details |
| mL | milliliter | | | | Details |
| mL/mL | milliliter per milliliter | | | | Details |
| MLHZ | millihertz | | | | Details |
| MMLL | millimole per liter | | | | Details |
| mmol | millimole | | | | Details |
| mmol/L | millimole per liter | | | | Details |
| mol/L | mole per liter | | | | Details |
| mol/m3 | mole per cubic meter | | | | Details |
| mole % | GeoFrame legacy unit | | | | Details |
| MOLL | mole per liter | | | | Details |
| MOLM | mole per cubic meter | | | | Details |
| Mrayl | megarayl | | | | Details |
| MTL | Maltese lira | | | | Details |
| NLG | Netherlands guilder | | | | Details |
| PLZ | Polish zloty | | | | Details |
| R/L | revolution per liter | | | | Details |
| rayl | rayl | | | | Details |
| ROL | Romainian leu | | | | Details |
| TRL | Turkish lira | | | | Details |
| U.S.gal | gallon (U.S.) (GeoFrame legacy unit) | | | | Details |
| U.S.gal/ft | GeoFrame legacy unit | | | | Details |
| umol | micromole | | | | Details |
| USGAL/MIN | gallon per minute | | | | Details |
| volts | volt | | | | Details |
| Volts | volt | | | | Details |
| 065L | Resistivity BKS B0.1A0.6M | | | | Details |
| 105L | Resistivity BKS B0.1A1M | | | | Details |
| 155L | Resistivity BKS B0.1A1.5M | | | | Details |
| 212L | CE Resistivity (B0.25A2M) | | | | Details |
| 212L1000 | CE Resistivity (B0.25A2M) 1/1000 spliced | | | | Details |
| 312L | Resistivity BKS B0.25A3M | | | | Details |
| 315L | Resistivity BKS B0.3A3M | | | | Details |
| 425L | Resistivity BKS B0.5A4M | | | | Details |
| 525L | Resistivity BKS B0.5A5M | | | | Details |
| 550L | Resistivity BKS M1N5A | | | | Details |
| 625L | Resistivity BKS B0.5A6M | | | | Details |
| 800L | Resistivity BKS B1A7.5M | | | | Details |
| 825L | Resistivity BKS B0.5A8M | | | | Details |
| 850L | Resistivity BKS B1A8M | | | | Details |
| ACAL | Average Caliper | | | | Details |
| CAL1 | 4arm-Caliper1 | | | | Details |
| CAL2 | 4arm-Caliper2 | | | | Details |
| CALI | Caliper | | | | Details |
| CALX | Caliper from X-Axis of X-Y Caliper(s) | | | | Details |
| CIL | Conductivity Induction | | | | Details |
| CILB | Conductivity Induction Backup | | | | Details |
| CILD | Deep Induction Conductivity | | | | Details |
| CNLSC | CN Long Space Counts | | | | Details |
| CCL | Casing Collar Locator Amplitude | | | | Details |
| DCAL | Diff.Caliper | | | | Details |
| DTL | Long Space Sonic Transit Time | | | | Details |
| HLLD | Deep Resistivity high res. LLD | | | | Details |
| HLLS | Resistivity high res. LLS | | | | Details |
| HRLD | Deep Resistivity high res. LLD | | | | Details |
| HRLS | Resistivity high res. LLS | | | | Details |
| ILD | Resistivity Deep Induction | | | | Details |
| L004 | Resistivity 2.5x2.5cm BKS/MLW | | | | Details |
| L004_DS | Resistivity Depth shifted 2.5x2.5 cm BKS/MLW | | | | Details |
| L006 | Resistivity 2.5x5cm BKS/MLW | | | | Details |
| L008 | Resistivity 2x7cm BKS | | | | Details |
| L009 | Resistivity 2.5x7.5cm BKS/MLW | | | | Details |
| L009_DS | Resistivity Depth shifted 2.5x7.5 cm BKS/MLW | | | | Details |
| L010 | Resistivity 7x7cm BKS | | | | Details |
| L015 | Resistivity 4x13cm BKS | | | | Details |
| L016 | Resistivity 2x15cm BKS | | | | Details |
| L025 | Resistivity BKS M0.2A0.1B | | | | Details |
| L027 | Resistivity 7x23cm BKS | | | | Details |
| L035 | Resistivity BKS M0.3A0.1B | | | | Details |
| L065 | Resistivity BKS M0.6A0.1B | | | | Details |
| L067 | Resistivity BKS A0.6M0.125N | | | | Details |
| L070 | Resistivity BKS M0.65A0.1B | | | | Details |
| L095 | Resistivity BKS M0.9A0.1B | | | | Details |
| L122 | Resistivity BKS M1.1A0.25B | | | | Details |
| L155 | Resistivity BKS M1.5A0.1B | | | | Details |
| L156 | Resistivity BKS A1.5M0.125N | | | | Details |
| L162 | Resistivity BKS M1.5A0.25B | | | | Details |
| L212 | Resistivity BKS M2A0.25B | | | | Details |
| L312 | Resistivity BKS A3.0M0.250N | | | | Details |
| L315 | Resistivity BKS M3A0.3B | | | | Details |
| L412 | Resistivity BKS M4A0.25B | | | | Details |
| L425 | Resistivity BKS M4A0.25B | | | | Details |
| L625 | Resistivity BKS M6A0.5B | | | | Details |
| L635 | Resistivity BKS M6A0.7B | | | | Details |
| L650 | Resistivity BKS M6A1.0B | | | | Details |
| L825 | Resistivity BKS M8A0.5B | | | | Details |
| L850 | Resistivity BKS M8A1B | | | | Details |
| LAT | Resistivity 18ft 8in Lateral | | | | Details |
| LL | Resistivity Laterolog | | | | Details |
| LL3 | Resistivity Laterolog 3 | | | | Details |
| LL7 | Resistivity Laterolog 7 | | | | Details |
| LLD | Resistivity Laterolog Deep | | | | Details |
| LLS | Resistivity Laterolog Shallow | | | | Details |
| LN | Resistivity 64 in Normal | | | | Details |
| LSN | Long-Space Neutron Counts | | | | Details |
| MCAL | Microlog Caliper | | | | Details |
| MLL | Resistivity Microlaterolog | | | | Details |
| MSFL | Resistivity MicroSFL | | | | Details |
| NL15 | Neutron counts - 15.5in Spacing | | | | Details |
| NL16 | Neutron counts - 16.5in Spacing | | | | Details |
| NL19 | Neutron counts - 19in Spacing | | | | Details |
| NLIMNF | Neutron Porosity Near/Far (Limestone) | | | | Details |
| NPLM | Neutron Porosity Limestone (Memory) | | | | Details |
| RACLM | Resistivity LWD deep | | | | Details |
| RMLL | Resistivity from Microlaterolog | | | | Details |
| RSAL | Shallow Attenuation Resistivity from 500 KHZ frequ. | | | | Details |
| RSPL | Shallow Phase Resistivity from 500 KHZ frequ. | | | | Details |
| RMPL | Medium Phase Resistivity from 500 KHZ frequ. | | | | Details |
| RDPL | Deep Phase Resistivity from 500 KHZ frequ. | | | | Details |
| RMAL | Medium Attenuation Resistivity from 500 KHZ frequ. | | | | Details |
| RDAL | Deep Attenuation Resistivity from 500 KHZ frequ. | | | | Details |
| RT_212L | Resistivity filtered 212L | | | | Details |
| SFLU | Spherical Focused Resistivity unaveraged | | | | Details |
| VCL | Volume of Clay | | | | Details |
| VELC | Compressional Velocity | | | | Details |
| CALI | Caliper | | | | Details |
| HCAL | HRCC Caliper Calibrated | | | | Details |
| HLLD | HALS Laterolog Deep Resistivity | | | | Details |
| HLLS | HALS Laterolog Shallow Resistivity | | | | Details |
| MLL | Microlaterolog (linear and hybrid Scale), Mudlog | | | | Details |
| NPLM | Neutron Porosity Limestone (Memory) | | | | Details |
| RMLL | Resistivity from Micro Laterolog | | | | Details |
| VCL | Volume of Clay | | | | Details |
| VCL1 | Volume of Clay 1 Relative to Total Volume | | | | Details |
| VCLC | Volume of Calcite Relative to Total Volume | | | | Details |
| VCL_CPX | Volume of Clay | | | | Details |
| VELC | Compressional Velocity | | | | Details |
| VCOAL | Volume of Coal | | | | Details |
| VDOL | Volume of Dolomite relative to total Volume | | | | Details |
| VDOL_CPX | Volume of Dolomite | | | | Details |
| VILL | Volume of Illite (dry) Relative to Total Volume | | | | Details |
| VLIM | Volume of Limestone | | | | Details |
| VLS_CPX | Volume of Limestone | | | | Details |
| ALARP | As Low As Reasonable Practicable | | | | Details |
| AML | Activity Management Loop | | | | Details |
| FEL | Front End Loading | | | | Details |
| LDs | Liquidated Damages | | | | Details |
| LLP's | Long Lead Procurement? | | | | Details |
| LPG | Liquified Petroleum Gas | | | | Details |
| LSIR | Location-Specific Individual Risk (HSEQ) | | | | Details |
| LTI | Lost Time Injury (HSEQ) | | | | Details |
| PLL | Potential Loss of Life (HSEQ) | | | | Details |
| alab | alabastrine | | | | Details |
| alg | algal | | | | Details |
| belem | belemnites | | | | Details |
| bflst | bafflestone | | | | Details |
| blky | blocky | | | | Details |
| blmg | blooming | | | | Details |
| Calct | calcite | | | | Details |
| Cbl | cobbles | | | | Details |
| CGL | CONGLOMERATE | | | | Details |
| Cglc | conglomeratic | | | | Details |
| Chlor | chloritic | | | | Details |
| Clut | calcilutite | | | | Details |
| Clye | clayey | | | | Details |
| Col | color | | | | Details |
| Crbly | crumbly | | | | Details |
| Crpxl | cryptocrystalline | | | | Details |
| Crystal | crystals | | | | Details |
| Cxln | coarsely crystalline | | | | Details |
| dl | dull | | | | Details |
| dolc | dolomitic | | | | Details |
| fl | flow | | | | Details |
| fld | feldspathic | | | | Details |
| flky | flaky | | | | Details |
| fluor | fluorescence | | | | Details |
| fexln | finelycrystaline | | | | Details |
| glau | glauconite | | | | Details |
| hbld | hornblende | | | | Details |
| hkly | hackly | | | | Details |
| incl | inclined | | | | Details |
| inclined | inclusious | | | | Details |
| intlam | interlaminations | | | | Details |
| intxl | intercrystalline | | | | Details |
| kaol | kaolinite | | | | Details |
| lam | laminated | | | | Details |
| lams | laminations | | | | Details |
| latc | lateritic | | | | Details |
| lav | lavender | | | | Details |
| LCM | lost circulation materials | | | | Details |
| lithic | lithographic | | | | Details |
| lmn | limonitic | | | | Details |
| LS | LIMESTONE | | | | Details |
| lse | loose | | | | Details |
| lt | light | | | | Details |
| micxl | microcrystalline | | | | Details |
| mrly | marly | | | | Details |
| occl | occasional | | | | Details |
| pbl | pebbles | | | | Details |
| pl | pale | | | | Details |
| plsl | palesol | | | | Details |
| poly | poly | | | | Details |
| polyxl | polycrystalline | | | | Details |
| ptcl | particles | | | | Details |
| rbly | rubbly | | | | Details |
| rtlt | rootless | | | | Details |
| shl | shells | | | | Details |
| sil | siliceous | | | | Details |
| skel | skeletal | | | | Details |
| sl | slightly | | | | Details |
| slo | slow | | | | Details |
| SLTST | SILTSTONE | | | | Details |
| stylo | stylolitic | | | | Details |
| trmln | tourmaline | | | | Details |
| trnsl | translucent | | | | Details |
| wl | well | | | | Details |
| wkly | weakly | | | | Details |
| wld | welded | | | | Details |
| xl | crystal | | | | Details |
| xls | crystals | | | | Details |
| xlam | cross laminated | | | | Details |
| bbl | Barrel of oil | | | | Details |
| CLSSM | Compensated Long Spaced Sonic MultiLink | | | | Details |
| DLL | Dual Laterolog Log | | | | Details |
| ELMT | Exploration License Management System | | | | Details |
| FEL | Front-End Loading | | | | Details |
| glg | ganz liebe Grüße | | | | Details |
| ITIL | Information Technology Infrastructure Library | | | | Details |
| KRL | Konzernrichtlinie | | | | Details |
| lg | Liebe Grüße | | | | Details |
| LGM | Lead Group Member | | | | Details |
| LIP | Locked In Potential | | | | Details |
| LL | Lessons Learned | | | | Details |
| LLI | Long Lead Item | | | | Details |
| LOF | Life of Field | | | | Details |
| LP | Listprice | | | | Details |
| LP | Lineare Optimierung | | | | Details |
| LP | Linear Programming | | | | Details |
| LPG | Liquified Petroleum Gas | | | | Details |
| LPG | Flüssiggas | | | | Details |
| LS | Linear Solver | | | | Details |
| LTI | Lost Time Index | | | | Details |
| LTSA | Long Term Service Agreement | | | | Details |
| LWDI | Lost Workday Injury | | | | Details |
| MMBBL | Million Barrels of Oil Equivalent | | | | Details |
| OIL | Opportunity Identification List | | | | Details |
| OM&L | Operation, Maintenance & Logistic | | | | Details |
| Pl | Chance of Low (Estimate) | | | | Details |
| PLO | Project List Overview | | | | Details |
| REAL | Regulations Alignment Plattform | | | | Details |
| SLA | Service Level Agreement | | | | Details |
| SPULSE | Slim Pulse MWD Directional | | | | Details |
| TAL | Transalpine Pipeline | | | | Details |
| TelCo | Telephone Conference | | | | Details |
| TGLC | Tollgate Light Committee | | | | Details |
| VOLTS | Volume Tracking System | | | | Details |
| ABL | Alternate Borehole Liner | | | | Details |
| AELB | Atomic Energy Licensing Act | | | | Details |
| APL | Annular Pressure Loss | | | | Details |
| ASCL | Acoustic Super Combo Log | | | | Details |
| BALS | Baker Atlas Logging Services | | | | Details |
| BLC | Big Lever Club | | | | Details |
| CLFL | Choke Line Friction Losses | | | | Details |
| CORAL | Cost Reduction Alliance Malaysia | | | | Details |
| GR/CCL | Gamma Ray/Casing Collar Logging | | | | Details |
| ILT | Invisible Lost Time | | | | Details |
| L/D | Lay down | | | | Details |
| L/O | Lay out | | | | Details |
| LE | Latest Estimates | | | | Details |
| LIB | Impression tool (Lead Impression Block) | | | | Details |
| LND | Learning & Development | | | | Details |
| Lo/Hi-vis | Low and High Viscous mud used in conjunction with sea water in order to lift cuttings up to surface | | | | Details |
| LOA | Letter of Authorisation | | | | Details |
| LOI | Letter of Intent | | | | Details |
| LOS | Latest on Site | | | | Details |
| LOT | Leak off test. To determine formation strength. | | | | Details |
| NGL | Natural Gas Liquid | | | | Details |
| O/pull | Overpull | | | | Details |
| P&L | Profit and Loss (account) | | | | Details |
| PDL | Pre drilled liner Liner with holes along its length; | | | | Details |
| RLL | Recorded Lithology Log | | | | Details |
| TL | Team Leader | | | | Details |
| TL | Technical Limit | | | | Details |
| FL | Financial leverage | | | | Details |
| GL | General Ledger | | | | Details |
| ILCLP | IdentLogic Systems Customer Loyalty Program | | | | Details |
| LBO | Leveraged Buyout | | | | Details |
| LIBOR | London Interbank Offered Rate | | | | Details |
| LIFFE | London International Financial Futures and Options Exchange | | | | Details |
| LIFO | Last In, First Out | | | | Details |
| LME | London Metal Exchange | | | | Details |
| Ltd | Limited Company | | | | Details |
| NPL | Non performing loan | | | | Details |
| SLA | Service Level Agreement | | | | Details |
| WLL | With Limited Liability | | | | Details |
