A Novel Permeability Model of Coal Considering Gas Slippage and Gas Sorption-Induced Strain

Man Wang and Junpeng Zou
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Man Wang: College of Information Engineering, Wuhan Business University, Wuhan 430056, China
Junpeng Zou: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Energies, 2022, vol. 15, issue 16, 1-17

Abstract: As an unconventional natural gas, coalbed methane (CBM) has been recognized as a significant fuel and chemical feedstock that should be recovered. Permeability is a key factor that controls CBM transport in coal. The slippage effect is an influential phenomenon that occurs during gas penetration processes, especially in low-permeable media. Apparent permeability may differ greatly from intrinsic permeability due to gas slippage. However, the gas slippage effect has not been considered in most analytical permeability models. Based on the cubic law, a new analytical model suited for the permeability analysis of coal under different stress conditions is derived, taking into consideration gas slippage and matrix shrinkage/swelling due to gas desorption/adsorption. To enhance its application, the model is derived under constant hydrostatic stress and pore pressure. The new analytical model is then compared with the existing models, and its reliability is verified by the comparison between the analytical prediction and the experimental permeability data under different stress conditions.

Keywords: permeability; coal; gas desorption/adsorption; gas slippage effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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