Multiple level methane drainage shaft system

Details Multiple level methane drainage shaft system Multiple level methane drainage shaft system

E - Fixed Constructions

21

F

166/27

E21F 7/00 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1193184

ABSTRACT OF THE DISCLOSURE A method for collecting gas, particularly methane gas, from subterranean formations having a plurality of spaced coal seams containing the gas includes the steps of drilling at least one shaft from the earth's surface to a depth sufficient to intersect a plurality of seams containing the gas to be collected, excavating a working area at selected seams with each of the working areas communicating with the shaft, and drilling a plurality of boregoles from each of the working areas into the seams and collecting methane gas from the boreholes, the method providing for recovery of gas from underground or subterranean formations irrespective of possible subsequent mining of the seams.

436977

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