BioSqueeze Inc. was contracted to mitigate annular gas on the 13-3/8 in x 9-5/8 in annulus on a previously plugged well in Ohio. The well was prepared by drilling out existing cement to 400 ft, cleaning the section milled window, running 2-1/16 in tubing to 395 ft, and setting a packer 390 ft.
Our team arrived on site and began pumping our biomineralizing solution. Six injection sequences were then run over a 1.5 day period. At the conclusion of each sequence pressure falloff was measured to evaluate progress.
Pressure was stepped up incrementally in the first stage to 1,400 psi before dropping to around 1,000 psi when injection increased to 0.3 gpm. This breakthrough allowed a significant amount of fluids to be injected at the end of the first stage, which carried over to the beginning of stage two. Injection decreased steadily throughout stage two and continued to do so across the next four stages.
The flow rate began at 0.255 gpm in the first sequence and ended at 0.003 gpm at the conclusion of the final sequence. This constituted a 98.8% decrease in injectivity, implying significant formation of calcium carbonate in leakage pathways.
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