Method for recovering methane from a solid carbonaceous subterra

Details Method for recovering methane from a solid carbonaceous subterra Method for recovering methane from a solid carbonaceous subterra

1996-10-21

2000-09-19

Suchfield, George A.

Wells

Processes

Cyclic injection then production of a single well

166268, E21B 4318

Patent

active

061197785

ABSTRACT:
A method is disclosed for recovering methane from a solid carbonaceous subterranean formation having a production well in fluid communication with the formation and an injection well in fluid communication with the formation. In the method an oxygen-depleted effluent, produced by a cryogenic separator is injected into the formation through the injection well. A first methane-containing gaseous mixture is recovered from the formation through the production well-during at least a portion of the time the oxygen-depleted effluent is being injected into the formation. The first methane-containing gaseous mixture has a first methane-desorbing gas volume percent. The injection of oxygen-depleted effluent is ceased and thereafter a second methane-containing gaseous mixture is recovered from the formation which has a second methane-desorbing gas volume percent which is less than the first methane-desorbing gas volume percent.

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