Method for control of subsurface coal gasification

Details Method for control of subsurface coal gasification Method for control of subsurface coal gasification

1975-10-23

1976-12-14

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166256, 166245, E21B 4324

Patent

active

039970051

ABSTRACT:
The burn front in an in situ underground coal gasification operation is controlled by utilizing at least two parallel groups of vertical bore holes disposed in the coalbed at spaced-apart locations in planes orthogonal to the plane of maximum permeability in the coalbed. The combustion of the coal is initiated in the coalbed adjacent to one group of the bore holes to establish a combustion zone extending across the group while the pressure of the combustion supporting gas mixture and/or the combustion products is regulated at each well head by valving to control the burn rate and maintain a uniform propagation of the burn front between the spaced-apart hole groups to gasify virtually all the coal lying therebetween.

REFERENCES:
patent: 2841375 (1958-07-01), Salomonsson
patent: 2901043 (1959-08-01), Campion et al.
patent: 3004594 (1961-10-01), Crawford
patent: 3031762 (1962-05-01), Parker
patent: 3032102 (1962-05-01), Parker
patent: 3113619 (1963-12-01), Reichle
patent: 3132692 (1964-05-01), Marx et al.
patent: 3154142 (1964-10-01), Latta
patent: 3933447 (1976-01-01), Pasini et al.

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