Permanent Abandonment enabled by DPAS BioSqueeze®

Tags: P&A

Aug 29, 2023


Leaking Annulus on a Well Plugged to Surface

BSI was contracted by an operator to mitigate annular pressure (2 psi buildup over several days shut -in) on the 9-5/8” x 13-3/8” annulus on a well being abandoned in Ohio.

The production string on the well was previously removed and the 9-5/8” casing was plugged to surface with cement.


TOC was identified at 27” below the casing head valve, within range of BSI’s annular access tool. Fresh water and surfactant were then circulated at high rate to clean and prep for a Deep Penetrating Annular Surface (DPAS) BioSqueeze®.

Injection began on day 1 with pressure gradually increased to 2,100 psi, where it was held constant, allowing the injection rate to decrease as leaks began to constrict. The well was then shut in at pressure overnight to allow biomineralization to continue. Pumping resumed at constant pressure as the injection rate decreased significantly. The well was shut in again prior to day 3. Day 3 concluded when fluids could hardly be injected, at which point the annulus was essentially locked up.

The final injection rate was just 0.007 gpm, constituting a 99% decrease. Gas flow persisted for several days after treatment concluded, but bled to 0 psi a short time later allowing the well to be capped, cut, and approved for permanent abandonment by ODNR.



Annulus Sealed - Well Permanently Abandoned
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Tags: P&A