Subterranean gasification of bituminous coal

Details Subterranean gasification of bituminous coal Subterranean gasification of bituminous coal

1980-07-21

1982-02-02

Novosad, Stephen J.

Wells

Processes

Electric current or electrical wave energy through earth for...

48DIG1, 166259, C10J 500, E21B 43243, E21B 43247, E21C 4300

Patent

active

043134998

ABSTRACT:
In the underground gasification of a swelling coal the high gas-flow link between the injection and the production wells needed for the gasification process is produced by reverse combustion using air heated to a temperature below the softening point of the coal. The heated air pretreats and conditions the coal proximate to the link under formation by increasing its permeability and reducing its swelling properties. Improved combustion and suppression of plugging results in the subsequent gasification stage.

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