BSI was contracted to mitigate gas on the 8-5/8” x 5-1/2” annulus on a well in Pennsylvania. An acoustic log identified the source at 1,600’. To prepare the well, a bridge plug was set at 1,370’, cutting two narrow sand notches through the 5-1/2” casing just above the plug, installing 2-3/8” tubing to the depth of the bottom notch, and setting a packer just above the top notch.
Nine injection stages were pumped to seal the leak at the source. The flow rate began at 0.262 gpm in the 1st stage and ended at 0.002 gpm at the conclusion of the 9th stage, with a total of 108 gal injected. This constituted a 99.2% decrease in injectivity, implying significant sealing.
Despite sealing the leak at the source, annular gas was only reduced and not completely eliminated. A zero pressure and pressure CBL were then used to inform further remediation. A comparison of CBLs pre and post BioSqueeze® showed the source of the gas was effe tively sealed and that there was a secondary zone higher in the well were gas was still entering the annulus.
To completely eliminate the flow of gas up the annulus another squeeze was conducted at 425’. The flow rate began at 0.060 gpm in the 1st stage and ended at 0.006 gpm at the conclusion of the 9th stage, with a total of 23 gal injected, a 90.0% decrease in injectivity.
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