Diffusion of gases in American coals

Olague, N.E.; Smith, Douglas M.

doi:10.1016/0016-2361(89)90034-3

Cited by 26 publications

(14 citation statements)

References 10 publications

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“…Moreover, the simulations indicate that CH 4 micropore diffusivity is about 10 times less than CO 2 micropore diffusivity. The predicted CH 4 effective micropore diffusivities are consistent with experimental measurements 35…”

Section: Resultssupporting

confidence: 81%

Modeling gas displacement kinetics in coal with Maxwell‐Stefan diffusion theory

et al. 2007

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in Wiley InterScience (www.interscience.wiley.com).The kinetics of binary gas counter-diffusion and Darcy flow in a large coal sample were modeled, and the results compared with data from experimental laboratory investigations. The study aimed for a better understanding of the CO 2 -sequestration enhanced coalbed methane (ECBM) recovery process. The transport model used was based on the bidisperse diffusion mechanism and Maxwell-Stefan (MS) diffusion theory. This provides an alternative approach to simulate multicomponent gas diffusion and flow in bulk coals. A series of high-stress core flush tests were performed on a large coal sample sourced from a Bowen Basin coal mine in Queensland, Australia to investigate the kinetics of one gas displacing another. These experimental results were used to derive gas diffusivities, and to examine the predictive capability of the diffusion model. The simulations show good agreements with the displacement experiments, revealing that MS diffusion theory is superior for describing diffusion of mixed gases in coals compared with the constant Fick diffusivity model. The optimized effective micropore and macropore diffusivities are comparable with experimental measurements achieved by other researchers.

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Section: Resultssupporting

confidence: 81%

Modeling gas displacement kinetics in coal with Maxwell‐Stefan diffusion theory

et al. 2007

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“…Previous research shows that diffusion rates increase with temperature and decrease with moisture content (Busch et al, 2004;Gruszkiewicz et al, 2009). Methane diffusivity has been measured at 2.93 Â 10 À 7 to 3.70 Â 10 À 5 cm 2 /s (Olague and Smith, 1988), while other measured results range from 10 À 8 to 10 À 11 cm 2 /s (Clarkson and Bustin, 1999;Cui et al, 2004). Heterogeneity in coal composition (Karacan, 1999), pore structure (Cai et al, 2013) and matrix moisture content ) may vary significantly from coal to coal, which will make the diffusion coefficients variable.…”

Section: Reservoir Properties and Coal Structurementioning

confidence: 99%

Preliminary evaluation of gas content of the No. 2 coal seam in the Yanchuannan area, southeast Ordos basin, China

Cai

Liu

Keming

et al. 2014

Journal of Petroleum Science and Engineering

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“…Diamond and Schatzel reviewed the common techniques for gas content measurement through sorption [9] and Clarkson and Bustin reported their laboratory and modeling studies on adsorption of coalbed methane in coal [10,11]. A representative study on gas diffusion through coal has been reported by Thimons and Kissel [12] and Olague and Smith [13]. Gas flow through coal is largely controlled by permeability of coal which has been received growing attentions.…”

Section: Introuductionmentioning

confidence: 97%

A review on transport of coal seam gas and its impact on coalbed methane recovery

Wang

Xiao-dong

Wei

et al. 2011

Front. Chem. Sci. Eng.

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This paper presents a summary review on mass transport of coal seam gas (CSG) in coal associated with the coalbed methane (CBM) and CO 2 geo-sequestration enhanced CBM (CO 2 -ECBM) recovery and current research advances in order to provide general knowledge and fundamental understanding of the CBM/ECBM processes for improved CBM recovery. It will discuss the major aspects of theory and technology for evaluation and development of CBM resources, including the gas storage and flow mechanism in CBM reservoirs in terms of their differences with conventional natural gas reservoirs, and their impact on CBM production behavior. The paper summarizes the evaluation procedure and methodologies used for CBM exploration and exploitation with some recommendations.

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Diffusion of gases in American coals

Cited by 26 publications

References 10 publications

Modeling gas displacement kinetics in coal with Maxwell‐Stefan diffusion theory

Modeling gas displacement kinetics in coal with Maxwell‐Stefan diffusion theory

Preliminary evaluation of gas content of the No. 2 coal seam in the Yanchuannan area, southeast Ordos basin, China

A review on transport of coal seam gas and its impact on coalbed methane recovery

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