An improved permeability model of coal for coalbed methane recovery and CO2 geosequestration

Wang, G. X., Massarotto, P. and Rudolph, V. (2009) An improved permeability model of coal for coalbed methane recovery and CO2 geosequestration. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 77 1-2: 127-136. doi:10.1016/j.coal.2008.10.007

Author Wang, G. X.
Massarotto, P.
Rudolph, V.
Title An improved permeability model of coal for coalbed methane recovery and CO2 geosequestration
Journal name INTERNATIONAL JOURNAL OF COAL GEOLOGY   Check publisher's open access policy
ISSN 0166-5162
Publication date 2009-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.coal.2008.10.007
Volume 77
Issue 1-2
Start page 127
End page 136
Total pages 10
Editor Hower, J. C.
Dai, S.
Place of publication Netherlands
Publisher Elsevier BV
Language eng
Subject C1
850299 Mining and Extraction of Energy Resources not elsewhere classified
0913 Mechanical Engineering
0403 Geology
0406 Physical Geography and Environmental Geoscience
Abstract An alternative approach is proposed to develop an improved permeability model for coalbed methane (CBM) and CO2-enhanced CBM (ECBM) recovery, and CO2 geosequestration in coal. This approach integrates the textural and mechanical properties to describe the anisotropy of gas permeability in coal reservoirs. The model accounts for the stress dependent deformation using a stress-strain correlation, which allows determination of directional permeability for coals. The stress-strain correlation was developed by combining mechanical strain with sorption-induced strain for any given direction. The mechanical strain of coal is described by the general thermo-poro-elastic constitutive equations for solid materials under isothermal conditions and the sorption-induced strain is approximated by treating the swelling/shrinkage of coal matrix equivalent to the thermal contraction/expansion of materials. With directional strains, the permeability of coal in any given direction can be modeled based on the theory of rock hydraulics. In this study, the proposed model was tested with both literature data and experiments. The experiments were carried out using a specially designed true tri-axial stress coal permeameter (TTSCP). The results show that the proposed model provides better predictions for the literature data compared with other conventional coal permeability models. The model also gives reasonable agreement between the predicted and measured stress-strains and directional permeabilities under laboratory conditions.
Keyword Coal
Coalbed Methane (CBM)
CO2-enhanced CBM (ECBM)
CO2 Geosequestration
Directional Permeability
Q-Index Code C1
Q-Index Status Provisional Code

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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Created: Thu, 03 Sep 2009, 09:00:36 EST by Mr Andrew Martlew on behalf of School of Chemical Engineering