Process for recovering methane and/or sequestering fluids
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United States of America Patent
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Jul 2, 2002
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N/A
app pub date -
Dec 18, 2000
filing date -
Nov 24, 2000
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Abstract
A process for recovering methane from a coal bed and/or sequestering a fluid more strongly adsorbing than methane ('SAG') 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 flow resistance.
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