Recovery of hydrocarbons from coal

Details Recovery of hydrocarbons from coal Recovery of hydrocarbons from coal

E - Fixed Constructions

21

B

166/36

E21B 43/24 (2006.01) E21B 43/18 (2006.01) E21B 43/247 (2006.01) E21B 43/40 (2006.01)

Patent

CA 1056302

ABSTRACT OF THE DISCLOSURE Coal liquids and gases are recovered from a thick underground coal seam by drilling one or more boreholes from the earth's surface into the lower part of the seam, burning out the coal over a limited area near the bottom of the seam, collapsing the overlying coal to form a rubblized zone extending vertically to a point near the upper boundary of the seam, driving a flame front vertically through the rubblized zone to liberate hydrocarbon liquids and produce gases, and recovering the liquids and gases from the rubblized zone.

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