Wells – Processes – In situ combustion
Patent
1980-07-21
1981-10-27
Novosad, Stephen J.
Wells
Processes
In situ combustion
48210, 48DIG6, E21B 43247, E21C 4300
Patent
active
042968097
ABSTRACT:
In the underground gasification of a swelling coal the bulk permeability of the coal proximate to the linkage between the injection and the production holes is increased and the plugging of the linkage during the in situ combustion and gasification procedure is suppressed by subjecting this coal proximate to the linkage between the injection and production holes to a stream of air heated to a temperature below the softening point of the coal prior to the in situ combustion and gasification procedure.
REFERENCES:
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patent: 3004594 (1961-10-01), Crawford
patent: 3019837 (1962-02-01), Mark et al.
patent: 3032102 (1962-05-01), Parker
patent: 3209825 (1965-10-01), Alexander et al.
patent: 3630278 (1971-12-01), Parker
patent: 3775073 (1973-11-01), Rhoades
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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