Producing methane from coal in situ

Details Producing methane from coal in situ Producing methane from coal in situ

1976-12-16

1978-05-16

Novosad, Stephen J.

Wells

Processes

In situ combustion

166258, 166314, E21B 4324, E21B 4326

Patent

active

040893740

ABSTRACT:
A well is drilled from the surface of the earth into an underground coal formation. The coal seam is fractured by fluids injected under pressure. Methane entrained in the cracks and fissures is removed to surface facilities. Coal seam in the vicinity of well bore is partially dewatered. Diameter of well bore in the coal section is enlarged first by underreaming the hole, then by a vertical in situ burn to form a collection chimney. Methane desorbed from the coal is withdrawn to surface facilities.

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patent: 3999607 (1976-12-01), Pennington et al.
American Gas Assoc. Monthly, "Degasification of Coal Beds -- a Commercial Source of Pipeline Gas", vol. 56, No. 1, Jan. 1974, pp. 4-6.
Deul et al., "Coal Beds: a Source of Natural Gas", The Oil and Gas Journal, vol. 73, No. 24, Jun. 16, 1975, pp. 47-49.

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