Wells – Processes – In situ combustion
Patent
1980-07-21
1981-11-10
Novosad, Stephen J.
Wells
Processes
In situ combustion
48210, 48DIG6, E21B 43247, E21C 4300
Patent
active
042992850
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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patent: 3630278 (1971-12-01), Parker
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patent: 4130164 (1978-12-01), Datta
Graham Richard H.
Oder Robin R.
Tsai Shirley C.
Gulf Research & Development Company
Keith Deane E.
Novosad Stephen J.
Rose Donald L.
Stine Forrest D.
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