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Coalbed methane extraction
Coalbed methane extraction (CBM extraction) is a method for extracting methane from a coal deposit.
==Basic principles==
Methane adsorbed into a solid coal matrix (coal macerals) will be released if the coal seam is depressurised. Methane may be extracted by drilling wells into the coal seam. The goal is to decrease the water pressure by pumping water from the well. The decrease in pressure allows methane to desorb from the coal and flow as a gas up the well to the surface. Methane is then compressed and piped to market.
The objective is to avoid putting methane into the water line, but allow it to flow up the backside of the well (casing) to the compressor station. If the water level is pumped too low during dewatering, methane may travel up the tubing into the water line causing the well to become "gassy". Although methane may be recovered in a water-gas separator at the surface, pumping water and gas is inefficient and can cause pump wear and breakdown.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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