Method for removal of methane from coalbeds
Patent
·
OSTI ID:862456
A method for removing methane gas from underground coalbeds prior to mining the coal which comprises drilling at least one borehole from the surface into the coalbed. The borehole is started at a slant rather than directly vertically, and as it descends, a gradual curve is followed until a horizontal position is reached where the desired portion of the coalbed is intersected. Approaching the coalbed in this manner and fracturing the coalbed in the major natural fraction direction cause release of large amounts of the trapped methane gas.
- Research Organization:
- National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
- Assignee:
- United States of America as represented by United States Energy (Washington, DC)
- Patent Number(s):
- US 3934649
- OSTI ID:
- 862456
- Country of Publication:
- United States
- Language:
- English
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horizontal
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major
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slant
started
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