In situ method of processing bituminous coal

Details In situ method of processing bituminous coal In situ method of processing bituminous coal

1978-08-31

1980-10-28

Novosad, Stephen J.

Wells

Processes

In situ combustion

166307, 299 2, E21B 4324, E21B 4325

Patent

active

042301815

ABSTRACT:
Bituminous coal is processed in situ for the recovery of values therefrom by drilling at least one borehole into the underground deposit, introducing a solvent for inclusions of resinous and other uncarbonized vegetable matter present in the coal, which solvent may or may not also be effective in some degree to dissolve carbonaceous matter, removing the solvent pregnant with the dissolved matter, so as to leave a substantially permeable area of coal in the deposit at and adjacent to the end of the borehole, igniting the coal at the end of the borehole, and removing products of combustion from the permeablized area while introducing a combustion-supporting gas into the area for advancing a heat front through the permeablized area.

REFERENCES:
patent: 1532826 (1925-04-01), Lessing
patent: 2561639 (1951-07-01), Squires
patent: 2788956 (1957-04-01), Pevere et al.
patent: 3010707 (1961-11-01), Craighead et al.
patent: 3076506 (1963-02-01), Crawford
patent: 3167121 (1965-01-01), Sharp
patent: 3850477 (1974-11-01), Aldrich et al.
patent: 3990513 (1976-11-01), Perch
patent: 4032193 (1977-06-01), Drinkard et al.
patent: 4076078 (1978-02-01), Drinkard et al.

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