04222437 is referenced by 9 patents and cites 12 patents.

Gas is produced and extracted from a coal deposit by drilling a row of supply wells in the deposit for receiving air or another combustion supporting gas, cutting horizontal inclined supply passages along the bottom of the deposit extending from the bottom end of the supply wells to a channel at the other end of the deposit perpendicular to and interconnecting the supply passages, igniting the coal face in the channel to create a combustion zone, maintaining combustion by continuously supplying air to the combustion zone via the supply wells and supply passages, and continuously removing gases produced by combustion via a central discharge passage extending along the deposit parallel to the supply passages and production wells drilled from the surface to the discharge passage in a row perpendicular to the row of supply wells.

Title
Method for in situ gas production from coal seams
Application Number
6/38949
Publication Number
4222437
Application Date
May 14, 1979
Publication Date
September 16, 1980
Inventor
Karol Sabol
3116 - 67A St., Edmonton, Alberta
CA
Agent
Shlesinger Arkwright Garvey & Dinsmore
IPC
E21B 43/24
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