Vented

§ Thru-Tubing Bridge Plugs – A specialty plug capable of running thru small restrictions and setting in casing diameters three times its’ run-in diameter. Alone, a T-TBP is rarely considered a long term or permanent isolation mechanism. Typically, T-TBPs serves as a platform for cement slurry that is placed atop the T-TBP. The cement plug provides a permanent anchor and a long-term hydraulic seal. i. Positive Sealing T-TBPs – These plugs conform to the general T-TBP description, above. What makes this plug unique is that immediately upon setting, this plug system provides a positive compression seal which holds differential pressure. This immediate seal provides numerous economic and operational benefits not offered by vented plug systems. ii. Vented T-TBPs – These plugs conform to the general T-TBP description, above. Vented T-TBPs do not affect a positive casing seal. Their principal function is to provide a platform for the cement slurry. A vent tube provides a path to accommodate flow of wellbore fluid related to wire-lining in and out of the well during plug-back operations. Vented T-TBPs provide a static annular casing interval where the cement slurry can set up, bond to the casing, form a seal with the casing, and anchor the seal in place.