Conditioning a coal seam prior to in-situ gasification
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United States of America Patent
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Jul 19, 1983
Grant Date -
N/A
app pub date -
Aug 25, 1981
filing date -
Aug 25, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for conditioning a coal seam prior to in-situ gasification to increase the permeability of the coal seam to the flow of combustion-supporting gas therethrough and thus increase the efficiency of gasification wherein a wettability alteration fluid is injected into the coal seam via an injection well and fluids including the wettability alteration fluid are recovered from a spaced apart production well. Injection of the wettability alteration fluid is continued into the coal seam until the permeability thereof to the flow of the combustion-supporting gas therethrough has increased to a maximum extent. Suitable wettability alteration fluids include carbon dioxide, volatile amines, aqueous solutions containing phosphates, phenols, flue gas and alcohols, and mixtures thereof.
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