BioSqueeze® Seals Leaking Annuli Allowing P&A to Proceed

Tags: P&A

Jan 06, 2023


Gas on Both Annuli Delaying Abandonment

BSI was contracted to mitigate pressure on the 8-5/8” x 5-1/2” (A) and 11-3/4” x 8-5/8” (B) annuli on a well being abandoned in Pennsylvania. An acoustic log identified the source at around 1,600’ and a BioSqueeze® was performed. Sealing was successful at this depth (flow rate was reduced by 99%) and reduced gas (from 70% to 6% on the B annulus), but another source higher in the well continued to allow some migration.


A secondary source was identified at 630’ and a 2nd BioSqueeze® was performed.

Pressure was stepped up to 600 psi in the 1st stage, during which a significant volume of fluids were injected. While stepping up pressure in the 2nd stage a new leakage pathway was opened at 400 psi. Flow decreased considerably throughout the stage and at the conclusion of pumping, the well was shut in at pressure overnight to continue biomineralization.

Injection resumed the next morning at 400 psi. Flow was low, so pressure was increased to open new leakage pathways. Flow remained low throughout the 3rd stage into the 4th tapering off to essentially nothing.

The flow rate began at 0.4598 gpm in the 1st stage and ended at 0.0006 gpm at the conclusion of the 4th stage, with a total of 55 gal injected, a 99.9% decrease in injectivity. Gas and LEL were reduced and subsequent monitoring confirmed they had been eliminated.



Gas Eliminated, Well Efficiently Abandoned
Table Gas Table

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