RECOVERY OF METHANE GAS FOR COAL LAYER

Title:

RECOVERY OF METHANE GAS FOR COAL LAYER

Document Type and Number:

Japanese Patent JPS5664100

Kind Code:

A

Abstract:

Methane is recovered from an underground coal seam via a borehole which extends from the earth's surface through the overburden to a cavity that is in, partly in or proximate to the coal seam. The cavity is constructed and arranged to be collapsible. Coal from the coal seam moves toward the coal seam under the influence of triaxial compression converting adsorbed methane to free form methane that is recovered.

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Inventors:

DENISU JIYOOJI MASUJI

Application Number:

JP3095780A

Publication Date:

June 01, 1981

Filing Date:

March 13, 1980

Export Citation:

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Assignee:

ALGAS RECOURCES LTD

International Classes:

E21B43/26; E21F7/00; (IPC1-7): E21F7/00

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