In situ solution mining of coal

Details In situ solution mining of coal In situ solution mining of coal

1975-04-30

1976-08-10

Novosad, Stephen J.

Wells

Processes

Specific low fluid loss feature for fracturing fluid or...

166272, 166303, 299 5, E21B 4326, E21C 4104

Patent

active

039736288

ABSTRACT:
Underground strata surrounding a coal seam are prestressed by repeated fracturing with a settable material to strengthen and seal the strata to contain a hydrostatic pressure in the coal seam of about 100 to about 500 atmospheres, thereby providing a gas and liquid-tight seal surrounding and within the coal seam. After the strata surrounding the coal seam and the coal seam itself are sealed, an hydrogenating agent is supplied to the coal seam and is maintained at a temperature of approximately 300 to 500 degrees centigrade and a pressure of from about 100 to about 500 atmospheres to liquefy and hydrogenate the coal in situ. When a region of coal is liquefied out to the boundary of the prestressing, the liquefied coal is pumped out for use.

REFERENCES:
patent: 2595979 (1952-05-01), Pevere et al.
patent: 3007520 (1961-11-01), Frey
patent: 3102588 (1963-09-01), Fisher
patent: 3208514 (1965-09-01), Dew et al.
patent: 3598182 (1971-08-01), Justheim
patent: 3616855 (1971-11-01), Colgate

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