BSI was contracted to eliminate annular pressure on a well in Pennsylvania where previous remediation had failed. A 0 psi log showed no bond above 2,200’, while a 2,500 psi log indicated better bonding around 2,100’ due to prior treatment with a casing expansion tool. The well was prepared by drilling out cement to 2,100’, perforating at 2,095’ through the 5-1/2” casing string, and installing 2-3/8” tubing to the depth of the perf.
Three injection stages were run over a 36-hour period.
Pressure was stepped up incrementally in the 1st stage to 1,500 psi at which point a channel was opened that allowed a significant volume of fluids to be injected. Pressure held steady at 1,500 psi during the 2nd stage, and the injection rate fell considerably. The well was then shut in at pressure overnight to allow calcium carbonate to continue to form in the leakage pathways.
Pressure was stepped up to 1,750 psi in the 3rd stage and the injection rate remained very low throughout the stage, implying the leaks had been successful sealed.
The flow rate began at 0.636 gpm in the 1st stage and ended at 0.007 gpm at the conclusion of the final stage, with a total of 48.4 gal injected. This constituted a 98.9% decrease in injectivity, implying significant sealing.
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