Method of underground gasification of coal seam

Details Method of underground gasification of coal seam Method of underground gasification of coal seam

1984-02-09

1986-03-04

Suchfield, George A.

Wells

Processes

In situ combustion

166 50, 166256, 166292, E21B 33138, E21B 43247

Patent

active

045735310

ABSTRACT:
A method of underground gasification of a coal seam comprises the steps of opening it by drilling injection and production wells, interconnecting said wells, setting the coal afire and gasifying the coal by supplying a gaseous medium into the first wells and removing the produced gas from the second wells. The seam is gasified successively layer by layer in the direction from the roof of the seam to its bottom. Each subsequent layer is gasified after gasification of the preceding layer is completed and rock overlying the gasified layer is no longer shifted. The thickness of said layer is chosen so that the height of a zone containing cracks formed as a result of rock shift does not exceed the depth of occurrence of the gasified layer.

REFERENCES:
patent: 3116792 (1964-01-01), Purre
patent: 3198249 (1965-08-01), Willman
patent: 3208516 (1965-09-01), Prats
patent: 3563606 (1971-02-01), Sears
patent: 4096912 (1978-06-01), Lewis et al.
patent: 4243101 (1981-01-01), Grupping
patent: 4437520 (1984-03-01), Stoddard
patent: 4441554 (1984-04-01), Grupping
patent: 4502539 (1985-03-01), Grupping

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