Method for removal of methane from coalbeds

Details Method for removal of methane from coalbeds Method for removal of methane from coalbeds

1974-07-25

1976-01-27

Purser, Ernest R.

Wells

Processes

With indicating, testing, measuring or locating

166308, 166314, 299 12, E21B 4325, E21C 4104

Patent

active

039346498

ABSTRACT:
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.

REFERENCES:
patent: 3313348 (1967-04-01), Huitt et al.
patent: 3384416 (1968-05-01), Reuhl et al.
patent: 3563606 (1971-02-01), Sears
patent: 3835928 (1974-09-01), Strubhar et al.
patent: 3878884 (1975-04-01), Raleigh
"Degasifying Before Mining" by W. M. Merritts Coal Age, Aug. 1961, pp. 74-78.

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