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Behavior of coal-gas reservoirs.

Authors
Cervik-J
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, TPR-10, :1-10
NIOSHTIC No.
10000175
Abstract
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.
Keywords
Mine-gases; Mining-industry; Coal-mining; Underground-mining; Methane-control; Methanes; Methane-drainage; Mine-gases; Engineering-controls; Control-technology; Explosive-atmospheres; Explosive-gases
CAS No.
74-82-8
Publication Date
19690401
Document Type
IH
Fiscal Year
1969
NTIS Accession No.
NTIS Price
Identifying No.
TPR-10
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, TPR-10
State
PA
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