BioSqueeze® Seals Multiple Annuli with One Squeeze

Tags: P&A

Sep 23, 2022

CHALLENGE

Well Being Abandoned Experiencing Sustained Pressure in Two Annuli

BSI was contracted to mitigate pressure on a well in Pennsylvania leaking from both the 9-5/8” x 7” & 7” x 4-1/2” annuli. The well was prepared by cutting two narrow 360 degree sand notches at around 460’ through both the 4-1/2” and 7” casings, installing 2-3/8” tubing to the depth of the bottom notch, and setting a bridge plug just below the bottom notch.

APPROACH

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

Pressure was stepped up incrementally in the 1st stage to 500 psi at which point a channel was opened that allowed a significant volume of fluids to be injected. The flow rate remained high throughout the 2nd stage as well, before dropping considerably. At the conclusion of the 3rd stage the well was shut in at pressure overnight to allow calcium carbonate to continue to form in the leakage pathways.

The flow rate continued to steadily decrease over the next two stages, implying the leaks had been successful sealed.

The flow rate began at 0.694 gpm in the 1st stage and ended at 0.006 gpm at the conclusion of the final stage, with a total of 121.5 gal injected. This constituted a 99.1% decrease in injectivity, implying significant sealing.

Graph

RESULTS

Gas Migration Eliminated
Table

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