Wells – Processes – In situ combustion
Patent
1977-03-07
1978-07-25
Novosad, Stephen J.
Wells
Processes
In situ combustion
166262, 166292, 166261, 299 2, E21B 4324, E21B 4326, E21C 4300
Patent
active
041023978
ABSTRACT:
A previously mined underground coal deposit is sealed so that the underground void space can be pressurized for production by in situ techniques. Excavated communication passages are sealed by barricades which are further sealed by applying hydrostatic head pressure. Subsidence cracks are sealed by injection of mud slurry with additional sealing effected by maintaining hydrostatic head pressure with a column of the slurry. In situ production wells are drilled into the coal with hermetic seal accomplished in part by cementing a portion of the liner to the well bore and in part by the hydrostatic head pressure of a mud slurry positioned above the cement seal. Coal is ignited and burn patterns are established to cause reasonably uniform subsidence.
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In Situ Technology Inc.
Novosad Stephen J.
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