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A PROCESS FOR RECOVERING METHANE WHILE SEQUESTERING A STRONGER ADSORBING FLUID (SAF) AND A PROCESS FOR SEQUESTERING THE SAF
A PROCESS FOR RECOVERING METHANE WHILE SEQUESTERING A STRONGER ADSORBING FLUID (SAF) AND A PROCESS FOR SEQUESTERING THE SAF
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机译:封存更强的吸附液(SAF)时回收甲烷的过程和封固SAF的过程
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摘要
A process for recovering methane from a coal bed and/or sequestering a fluid more strongly adsorbing than methane ("SAO") in a coal bed involves fracturing an injection well and cyclically injecting SAG with intervening shut-in periods. Even though the absolute permeability of the coal bed decreases with continued SAG sorption, the SAG injectivity, surprisingly and unexpectedly, increases while injecting SAG at pressures greater than reservoir pressure, but less than fracture pressure or fracture extension pressure. The increased injectivity is thought to be due to a reduction in near-well How resistance.
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