2016
DOI: 10.1021/acs.energyfuels.6b01480
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Estimation of Pressure-Dependent Diffusive Permeability of Coal Using Methane Diffusion Coefficient: Laboratory Measurements and Modeling

Abstract: Gas diffusion in coal is critical for the prediction of coalbed methane (CBM) production, especially for the late-stage CBM reservoir when both gas pressure and permeability are relative low. Using only Darcy permeability to evaluate the quality of gas transport might not be effective. Diffusive flow can be the dominant flow at low reservoir pressures. In this work, the methane diffusion coefficient was measured for pulverized San Juan sub-bituminous and Pittsburgh bituminous coal samples using the classic uni… Show more

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Cited by 107 publications
(54 citation statements)
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“…Enhancing CBM production is important as production usually shows an extended flat tail in late depletion. This is principally controlled by gas desorption from nano-scale pores, gas diffusion through both nano- and micron-scale pores, and by secondary biogenic methanogenesis in cleats and fractures 14 . Specifically, for a particular ME-CBM field, the gas production potential can be influenced by the adsorption capacity of coal and coal maceral compositions, the availability of suitable biogeochemical organic matter for bacteria, favorable environmental conditions for microbial growth and evolution and the accessibility of a methanogenic microbial community to organic matter 15 , 16 .…”
Section: Introductionmentioning
confidence: 99%
“…Enhancing CBM production is important as production usually shows an extended flat tail in late depletion. This is principally controlled by gas desorption from nano-scale pores, gas diffusion through both nano- and micron-scale pores, and by secondary biogenic methanogenesis in cleats and fractures 14 . Specifically, for a particular ME-CBM field, the gas production potential can be influenced by the adsorption capacity of coal and coal maceral compositions, the availability of suitable biogeochemical organic matter for bacteria, favorable environmental conditions for microbial growth and evolution and the accessibility of a methanogenic microbial community to organic matter 15 , 16 .…”
Section: Introductionmentioning
confidence: 99%
“…It is proposed that the pressure dependent behavior on diffusivity for FKM could be interpreted by the result of combination of Knudsen below 2 MPa and bulk diffusion above 2 MPa, which is observed and analyzed by fractal theory-based approach in the other researches 39 , 40 . In the case of fast component of NBR and EPDM in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…e corresponding cumulative gas desorption amount is greater for the same amount of time, and a higher gas pressure promotes the gas desorption of coal. With the gradual increase in the gas pressure, the cumulative gas desorption of coal also increases in stages [33][34][35][36]. It is thus possible to derive a signi cant increase in gas desorption by increasing the gas pressure.…”
Section: E Ect Of the Pressure On The Desorption Characteristics Ofmentioning
confidence: 99%