BSI was contracted to assist with gas migration on a re-entry in Wyoming. Existing cement plugs prevented access for a perf and squeeze without drillout, prompting the operator to explore alternative remediation techniques. An attempt to eliminate gas flow was made with 10 PPG brine prior to our arrival but bubbling continued. BSI utilized surface injection to push fluids directly into leakage pathways in the annulus.
Pressure was stepped up to 1,200 psi in the 1st stage, with the flow rate decreasing steadily throughout. Pressure was quickly brought back up to 1,200 psi in the 2nd stage and a similar trend was observed. The well was then shut in at pressure overnight to allow crystals to continue growing and thereby reduce permeability.
Injection resumed the next morning at 1,200 psi, but was quickly increased to 1,500 psi due to low flow. Pumping at higher pressure allowed access to new leakage pathways, which increased the flow rate. The flow rate immediately began decreasing, which continued throughout the stage. At the end of the 3rd stage flow had all but ceased, indicating that all leakage pathways had been permanently sealed.
The flow rate began at 0.0482 gpm in the 1st stage and ended at 0.0009 gpm at the conclusion of the 3rd stage, with a total of 11.4 gal injected, and a 98.1% decrease in injectivity.
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