BioSqueeze® Eliminates Annular Gas Leak Migrating up the Wellbore

Tags: P&A

Nov 08, 2022

CHALLENGE

Gas Migration Halting Abandonment

BSI was contracted to mitigate gas traveling through the cemented 13-3/8” x 9-5/8” annulus and up the wellbore via the milled 9-5/8” casing top. A region of poor cement was identified just below the 13-3/8” shoe at 1,600’. The well was prepared by perforating through the 9-5/8” casing at 1,600’, installing 4-1/2” drill pipe to the depth of the bottom perf, and setting a bridge plug just below that.

APPROACH

Two injection stages were run over a 36-hour period.

Pressure was raised incrementally in the 1st stage and reached 1,400 psi around 80 minutes into pumping. Pressure was held steady for the next 120 min, during which the flow rate steadily fell. The well was then shut in at pressure overnight to allow minerals to continue to grow, choking off leakage pathways from the outside in.

Injection resumed the next morning at 1,400 psi, the flow rate experiencing a steady and significant decrease, implying leaks had been successful sealed. Pumping concluded around mid day and the well was shut in at pressure for another 12 hours to ensure all leakage pathways were completely closed.

The flow rate began at 0.252 gpm in the 1st stage and ended at 0.025 gpm at the conclusion of the 2nd stage, with a total of 68 gal injected. This constituted a 90.1% decrease in injectivity, implying significant sealing.

Graph

RESULTS

Leaks Permanently Sealed
Table

Download This Study

Enter your name and email below to download this case study.

View Some Of Our Other Case Studies

BioSqueeze® Eliminates Gas Flow Using Surface Injection

BSI was contracted to assist with gas migration on a re-entry in Wyoming. Existing cement plugs prevented access for a perf and squeeze without drillout, prompting the operator to explore alternative remediation techniques. BSI utilized surface injection to push fluids directly into leakage pathways in the annulus.

Tags: P&A

BioSqueeze® Seals Leaking Annuli Allowing P&A to Proceed

BSI eliminated gas flow on the production and intermediate annuli with the help of acoustic diagnostics.

Tags: P&A

BioSqueeze® Seals Bubbling Annulus Expediting Abandonment

BSI sealed leaks in a cemented annulus, eliminating gas flow, and allowing abandonment operations to proceed as planned.

Tags: P&A

WANT TO LEARN MORE?