Flowing Bottom Hole Pressure (Gas Producing Wells)
The first law of thermodynamics (conservation of energy) governs gas flow in tubing.
Wellbore performance analysis involves establishing a relationship between tubular size, wellhead and bottom-hole pressure, fluid properties, and fluid production rate. Understanding wellbore flow performance is vitally important to production engineers for designing oil well equipment and optimizing well production conditions.
Reference: Petroleum Production Engineering, Boyun Guo, Xinghui Liu, Xuehao Tan
Correlations
- 1-Average Temperature and Z-Factor
- 2-Cullender and Smith
- 3-Guo and Ghalambor
Input Parameters
| Name | Input Value - Unit | Converted Value | Validity | Link to Calculation Page | |||
|---|---|---|---|---|---|---|---|
| Gas Specific Gravity (ɣg) | 0.71 | SG | Average Surface Gas Gravity (ɣg) | ||||
| Tubing Diameter | 2.259 | in | |||||
| Relative Roughness (ε/d) More Details | 0.0006 | - | |||||
| Tubing Length | 10000 | ft | |||||
| Well Average Inclination Angle | 0 | Degrees | Well Deviation from Vertical | ||||
| Wellhead Flowing Pressure (Phf) | 800 | psi | |||||
| Wellhead Temperature (Thf) | 609.67 | °R | |||||
| Bottom Hole Temperature (Twf) | 659.67 | °R | |||||
| Well Gas Flow Rate (Qsc | 2 | Million ft/day - mmscf/day | |||||
| Oil Production Rate | 1000 | bbl/day - bpd | |||||
| Oil Specific Gravity | 0.85 | SG | |||||
| Water Production Rate | 300 | bbl/day - bpd | |||||
| Water Specific Gravity | 1.05 | SG | |||||
| Solid Production Rate | 1 | ft/day - scf/day | |||||
| Solid Specific Gravity | 2.65 | SG | |||||
| Friction Factor Calculation Method | 1 | ||||||
| Z-Factor Calculation Method | 3 | ||||||
| Pseudo Properties Calculation Method | 2 | ||||||
| Pseudo Critical Properties Correction Method | 2 | ||||||
| N2 Content | 0 | % | |||||
| CO2 Content | 0 | % | |||||
| H2S Content | 0 | % | |||||
| CALCULATE | |||||||
Results | |||||||
| Correlation | Calculated Value | Warnings | Remarks | ||||
| 1-Average Temperature and Z-Factor | 1071.426 | psi | Single average values of temperature and compressibility factor over the entire tubing length is assumed. This correlation is for pure gas flow. | ||||
| 2-Cullender and Smith | 929.138 | psi | This correlation is for pure gas flow. | ||||
| 3-Guo and Ghalambor | 2563.156 | psi | This correlation is used for impure gas flows (gas-oil-water-sand four-phase flow model) | ||||