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Mining Publication: Behavior of Coal-Gas Reservoirs

NOTE: This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.

Original creation date: May 1969

Image of publication Behavior of Coal-Gas Reservoirs

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.

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