BSI was contracted to mitigate gas on the 9-5/8” x 7” annulus on a well in Pennsylvania. An acoustic log identified the source around 3,200’. To prepare the well, a bridge plug was set at 3,000’, perforations were shot through the 7” casing just above the plug, 2-3/8” tubing was run to the depth of the bottom perf, and a packer was set just above the top notch.
Pressure was set at 1,900 psi in the 1st stage, with flow decreasing significantly. This held true across the 2nd stage as well, with around 57 gal of injected across the two stages. The well was then shut in at pressure overnight, allowing calcium carbonate crystals to form.
Injection resumed the next morning at 1,850 psi. A significant reduction in injectivity was immediately observed, implying significant growth overnight. A new leakage pathway was intersected in the 4th stage, which increased flow momentarily. Flow decreased steadily across the 4th & 5th stages and the well was shut in again overnight. Flow fell significantly overnight again and continued to drop across the last three stages.
The flow rate began at 0.363 gpm in the 1st stage and ended at 0.007 gpm at the conclusion of the 8th stage, with a total of 119 gal injected, a 98.1% decrease in injectivity. Gas was measured at surface throughout treatment and followed the same trend as flow rate.
Enter your name and email below to download this case study.