Wells – Processes – In situ combustion
Patent
1982-01-07
1983-12-27
Novosad, Stephen J.
Wells
Processes
In situ combustion
166245, C10J 500, E21B 43243, E21C 4300
Patent
active
044225059
ABSTRACT:
A method for gasifying subterranean coal deposits by positioning a cased injection well to extend from the surface into the coal deposit with the injection well extending horizontally through the lower portion of the coal deposit with the horizontal portion of the well being cased with a perforated casing; positioning an injection tubing in the injection well; positioning a production well to extend from the surface to a point near the lower end of the injection well; igniting the coal deposit; gasifying a portion of the coal deposit between the bottom of the production well and the lower end of the injection tubing well by injecting a free-oxygen containing gas into the coal deposit through the injection tubing and recovering product gases through the production well and thereafter gasifying a second portion of the coal deposit by withdrawing the injection tubing a selected distance and thereafter injecting free-oxygen containing gas into the coal deposit and recovering product gases from the production well.
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Atlantic Richfield Company
Novosad Stephen J.
Scott F. Lindsey
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