Multiple level methane drainage method

Details Multiple level methane drainage method Multiple level methane drainage method

E - Fixed Constructions

21

B

166/40

E21B 43/14 (2006.01) E21B 43/00 (2006.01) E21F 7/00 (2006.01)

Patent

CA 1228024

70892-3 MULTIPLE LEVEL METHANE DRAINAGE METHOD ABSTRACT A method for collecting methane gas from subterranean formations having a plurality of spaced-apart coal seams containing methane gas includes the steps of drilling a shaft from the earth's surface to a depth sufficient to inter- sect a plurality of seams containing gas to be collected, excavating a cruciform shaped working area at the selected seams with each of the cruciform shaped working areas communicating with the shaft, and drilling a plurality of boreholes from each of the working areas into the seams and collecting methane gas from the boreholes.

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