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The gas permeability of a coalbed, unlike that of conventional gas reservoirs, is influenced during gas production not only by the simultaneous changes in effective stress and gas slippage, but also by the volumetric strain of the coal matrix that is associated with gas desorption. A technique for conducting laboratory experiments to separate these effects and estimate their individual contribution...
This paper discusses the results of a laboratory study aimed at measuring the changes in the coal matrix volume with release of gas, and estimating the resulting changes in the cleat porosity and permeability of coal. The volumetric strain of the matrix of coal samples held at constant external pressure was measured with decreasing concentration of methane. From the results and a simple geometry...
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