Method of underground gasification of coal seam

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

E - Fixed Constructions

21

B

166/36

E21B 43/24 (2006.01) E21B 43/243 (2006.01) E21B 43/247 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1208541

Abstract A method of underground gasification of a coal seam comprises the steps of opening it by drilling injection a and production wells, interconnecting said wells, setting the coal afire and gasifying the coal by supplying a gase- ous medium into the first wells and removing the produced gas from the second wells. The seam is gasified successi- vely layer in the direction from the roof of the seam to its bottom. Each subsequent layer is gasified after gasifi- cation of the preceding layer is completed and rock over- lying 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.

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