BSI was contracted to eliminate casing pressure on a well in Pennsylvania leaking from the inside of the production casing. A camera run showed bubbles coming from the top and sides of a cement plug starting at 1,080’. The well was prepared by drilling out the existing cement to 1,260’ and setting 2-3/8” tubing just above the top of cement.
The flow rate was raised incrementally in the 1st stage to determine the injectivity of the cement. At around 2.3 gpm pressure began to build. In the 2nd stage pressure began at 550 psi and was stepped up to 750 psi. The flow rate slowly fell throughout the stage, and a significant volume of fluids were injected. The well was then shut in at pressure overnight to allow calcium carbonate crystals to continue to form in leakage pathways.
Injection resumed the next morning at 950 psi. Over the next four stages, the flow rate experienced a steady and significant decrease, implying leaks had been successful sealed.
The flow rate began at 2.103 gpm in the 1st stage and ended at 0.020 gpm at the conclusion of the final stage, with a total of 150 gal injected. This constituted a 99.0% decrease in injectivity, implying significant sealing. A dramatic decrease in bubbling at surface also suggested the leaks had been sealed.
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