Wells – Processes – In situ combustion
Patent
1977-12-28
1978-10-31
Novosad, Stephen J.
Wells
Processes
In situ combustion
48DIG6, 166 50, 166251, 166259, E21B 4324
Patent
active
041228979
ABSTRACT:
The present invention is directed to an in situ coal gasification process wherein the combustion zone within the underground coal bed is fed with air at increasing pressure to increase pressure and temperature in the combustion zone for forcing product gases and water naturally present in the coal bed into the coal bed surrounding the combustion zone. No outflow of combustion products occurs during the build-up of pressure and temperature in the combustion zone. After the coal bed reaches a temperature of about 2000.degree. F and a pressure in the range of about 100-200 psi above pore pressure the airflow is terminated and the outflow of the combustion products from the combustion zone is initiated. The CO.sub.2 containing gaseous products and the water bleed back into the combustion zone to react endothermically with the hot carbon of the combustion zone to produce a burnable gas with a relatively high hydrogen and carbon monoxide content. About 11 to 29 percent of the gas recovered from the combustion zone is carbon monoxide which is considerably better than the 4 to 10 percent carbon monoxide obtained by employing previously known coal gasification techniques.
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Chekin et al., "Underground Gasification of Coals," The Colliery Guardian, vol. CLII, No. 3939, Jun. 26, 1936, pp. 1193-1196.
Bissett Larry A.
Capp John P.
Carlson Dean E.
Hamel Stephen D.
Larcher Earl L.
Novosad Stephen J.
Suchfield George A.
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