Method for the in-situ extraction of gas from coal seams
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United States of America Patent
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-
Jun 3, 2003
Grant Date -
N/A
app pub date -
May 30, 2001
filing date -
Sep 2, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for the in-situ extraction of gas from coal seams is provided. Flow paths are produced in gas-containing coal by opening up the structure of the coal by introducing into a bore hole that is sunk into the coal at least one gas and/or liquid under pressure over a prolonged period of time at a pressure that is less than the lowest principal stress determined in a respective seam layer from which gas is to be extracted. The introduction into the bore hole is carried out with a cyclically fluctuating pressure. Gas is subsequently extracted via the bore hole.
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