BioSqueeze® Seals Annular Leak, Eliminating Gas Migration

Tags: P&A

Nov 11, 2022

CHALLENGE

Re-entry to Mitigate Annular Leak

BSI was contracted to seal a leak in the 7” x 4-1/2” annulus on a well in Pennsylvania. An acoustic log identified the source of the leak was at around 2,000’. The well was prepared by setting a bridge plug at 2,000’, cutting three narrow sand notches through the 4-1/2” casing just above the plug, installing 2-3/8” tubing to the depth of the bottom notch, and setting a packer just above the top notch.

APPROACH

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

Pressure was gradually increased in the 1st stage and brough up to 1,475 psi 30 min into pumping. Pressure was held steady for the next 100 min while flow rate held steady. Pressure was quickly brought up to 1,350 psi in the 2nd stage while flow rate fell steadily. This same trend continued through the conclusion of the 3rd stage. The well was then shut in at pressure overnight, which allowed calcium carbonate crystals to form.

Injection resumed the next morning at 1,475 psi. The flow rate was significantly lower than in the previous stage, implying substantial crystal growth overnight. The flow rate continued to fall across the final two stages and the well was shut in again after pumping.

The flow rate began at 0.910 gpm in the 1st stage and ended at 0.010 gpm at the conclusion of the 5th stage, with a total of 135 gal injected. This constituted a 98.9% decrease in injectivity, implying significant sealing.

Graph

RESULTS

Annulus Sealed, Well Permanently Abandoned
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?