BSI was contracted to mitigate annular gas on a well in Pennsylvania leaking from the 8-5/8” x 5-1/2” annulus. The well was prepared by cutting two narrow 360 degree sand notches at around 1,400’ through the 5-1/2” casing, installing 2-3/8” tubing to the depth of the bottom notch, and setting a bridge plug just below the bottom notch.
Five injection stages were run over a 36-hour period. Pressure was raised incrementally in the 1st stage to 1,500 psi, but little injection was achieved. In the 2nd stage pressure was increased to 1,600 psi which opened a channel and allowed a significant volume of fluids to be 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 1,350 psi during which another small channel opened. Over the next two stages, the flow rate experienced a significant and steady decrease, implying leaks had been successful sealed. The final stage concluded late in the day allowing the well to be sealed in overnight one more time.
The flow rate began at 0.118 gpm in the 1st stage and ended at 0.007 gpm at the conclusion of the final stage, with a total of 134 gal injected. This constituted a 94.1% decrease in injectivity, implying significant sealing.
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