BioSqueeze® Seals Leaking Cemented Annuli During P&A

Tags: P&A

Sep 12, 2022

CHALLENGE

Casing Pressure Holding up Abandonment

BSI was contracted to mitigate casing pressure on a well in Pennsylvania. The bond log indicated poor cement bonding throughout the well. Prior to our arrival an unsuccessful attempt to cut and pull the 5-1/2” casing was made. The well was prepared by cutting a sand notch at 1,050” through the 5-1/2” and 9-5/8” casing strings, setting a removable bridge plug just below the notch, and installing 2-3/8” tubing to the depth of the notch.

APPROACH

Seven injection stages were run over a 48-hour period. Pressure was stepped up incrementally in the 1st stage to 950 psi, but very little material was injected. Pressure was then raised to 1,250 psi at which point a channel was opened that allowed a significant volume of fluids to be injected. Pressure held steady at around 950 psi in the next two stages, with the injection rate remaining stable in the 2nd stage before dropping considerably in the 3rd stage.

During the remaining four stages pressure was held constant at around 900 psi and the injection rate steadily decreased until very little material could be injected, implying the leaks had been successful sealed.

The flow rate began at 1.081 gpm in the 1st stage and ended at 0.020 gpm at the conclusion of the final stage, with a total of 292 gal injected. This constituted a 98.1% decrease in injectivity, implying significant sealing.

Graph

RESULTS

Casing Pressure Eliminated
Table

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