Underground gasification of bituminous coal
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United States of America Patent
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-
Nov 10, 1981
Grant Date -
N/A
app pub date -
Jul 21, 1980
filing date -
Jul 21, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the underground gasification of a swelling coal the high gas-flow link between the injection and the production wells is produced by introducing hot air into the injection well at a pressure sufficient to fracture the coal. The bulk permeability of the coal proximate to the link is increased and the plugging of the link during the subsequent in situ combustion and gasification procedure is suppressed by continuing the injection of the hot air, heated to a temperature below the softening point of the coal, into the injection well, through the link to the production well without combustion of the coal.
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