BioSqueeze Inc. was contracted by an operator to seal a leaking annulus in a well in the process of being abandoned. Previous attempts to seal the leak had little to no impact. The well was prepared by perforating at 1,900 ft through the 9-5/8 in casing string, installing 2-3/8 in tubing, setting a removable bridge plug just below the perforations, and setting a packer just above the perforations.
Our team arrived on site and began pumping our biomineralizing fluid system down the well through the perforations and into the leakage pathways in the cemented annulus.
Five injection sequences were run over a 24-hour period, with the well being sealed in at pressure overnight. At the conclusion of each sequence pressure falloff was measured to evaluate progress.
The flow rate began at 1.09 gpm at the start of the first sequence and ended at 0.08 gpm at the conclusion of the final sequence, a 92.7% decrease in injectivity.
Bubbling at surface was completely eliminated and along with the significant reduction in injectivity, indicated the leak had been successfully sealed.
This was later confirmed via pressure, flow, and LEL testing allowing the well to be permanently abandoned.
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