Multiple level methane drainage shaft method

摘要

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 at least one shaft from the earth's surface to a depth sufficient to intersect a plurality of seams containing 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 boreholes from each of the working areas into the seams and collecting methane gas from the boreholes.