Multiple level methane drainage method
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United States of America Patent
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Sep 16, 1986
Issued Date -
N/A
app pub date -
May 11, 1984
filing date -
Sep 20, 1982
priority date (Note) -
Expired
status (Latency Note)
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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 intersect 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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