Wells – Processes – Cyclic injection then production of a single well
Patent
1995-02-13
1996-10-22
Suchfield, George A.
Wells
Processes
Cyclic injection then production of a single well
166268, E21B 4318
Patent
active
055667554
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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Puri Rajen
Seidle John P.
Yee Dan
Amoco Corporation
Sloat Robert E.
Suchfield George A.
Wakefield Charles P.
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