Mining Publication: Behavior of Coal-Gas Reservoirs

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Original creation date: May 1969

Authors: J Cervik

Reference - May 1969

NIOSHTIC2 Number: 10000175

U.S. Department of the Interior, Bureau of Mines. Technical Progress Report 10, 1969; :1-12

Gas occurs in coalbeds in an adsorbed and a free gas state. Adsorbed gas is stored in the micropore structure and its transport is governed by Fick's law. The free gas occurs in the fracture system and flows according to Darcy's law. These two modes of mass transport are interdependent. Production decline curves of coal-gas wells are of the constant percentage decline type and, thus, show no indications of flow characteristics peculiar to coal-gas reservoirs. The effectiveness of surface boreholes as a degasification scheme depends upon both good fracture permeability and a high fracture density. Conventional methods of reservoir engineering analysis are not applicable to coalbeds.

Image of publication Behavior of Coal-Gas Reservoirs
Reference - May 1969

NIOSHTIC2 Number: 10000175

U.S. Department of the Interior, Bureau of Mines. Technical Progress Report 10, 1969; :1-12


Page last reviewed: 6/2/2016 Page last updated: 9/21/2012