Sealing an underground coal deposit for in situ production

Details Sealing an underground coal deposit for in situ production Sealing an underground coal deposit for in situ production

1977-09-19

1978-06-06

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166292, E21B 3313

Patent

active

040933105

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.

REFERENCES:
patent: 1660187 (1928-02-01), Ehrat
patent: 1661389 (1928-03-01), Sinclair
patent: 1867758 (1932-07-01), Ranney
patent: 3856186 (1975-02-01), Von Hippel
patent: 3924680 (1975-12-01), Terry
patent: 4015663 (1977-04-01), Strubhar

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