BioSqueeze® Eliminates Sustained Casing Pressure in a Well being Decommissioned

Tags: P&A

Jul 18, 2022


Annular Pressure Preventing a Well from being Abandoned

BioSqueeze Inc. was contracted by an operator to eliminate annular pressure in a well in the process of being abandoned. Prior to our arrival, the well was prepared by perforating at 600 ft through the 3-1/2 in casing string, setting a removable bridge plug just below the perforations and installing 2-1/16 in tubing.


Our team arrived on site and began pumping our biomineralizing solution down the well and into the leakage pathways in the cemented annulus. Seven injection sequences were then run over a three day period. At the conclusion of each sequence pressure falloff was measured to evaluate progress.

Maximum pressure specified by the operator was 600 psi. Pressure quickly rose to 500 psi during the first sequence before dropping to around 16 psi. Pressure would not rise over 60 psi during the second sequence and it was discovered that a leaky ball valve was responsible. The ball valve was then replaced and for sequences four through seven pressure quickly rose to 600 psi.

The flow rate began at 0.8218 gpm at the start of the first sequence and ended at 0.0069 gpm at the conclusion of the final sequence. This constituted a 99.16% decrease in injectivity, which implied significant formation of calcium carbonate in the leaking annulus.



Annular Pressure Eliminated, Well Approved for Permanent Abandonment

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