Modeling anisotropic permeability of coal and its effects on CO2 sequestration and enhanced coalbed methane recovery

An, H., Wei, X. R., Wang, G. X., Massarotto, P., Wang, F. Y., Rudolph, V. and Golding, S. D. (2015) Modeling anisotropic permeability of coal and its effects on CO2 sequestration and enhanced coalbed methane recovery. International Journal of Coal Geology, 152 15-24. doi:10.1016/j.coal.2015.09.013

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Author An, H.
Wei, X. R.
Wang, G. X.
Massarotto, P.
Wang, F. Y.
Rudolph, V.
Golding, S. D.
Title Modeling anisotropic permeability of coal and its effects on CO2 sequestration and enhanced coalbed methane recovery
Journal name International Journal of Coal Geology   Check publisher's open access policy
ISSN 0166-5162
1872-7840
Publication date 2015-12-01
Sub-type Article (original research)
DOI 10.1016/j.coal.2015.09.013
Open Access Status File (Author Post-print)
Volume 152
Start page 15
End page 24
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 2103 Fuel Technology
1907 Geology
1905 Economic Geology
1913 Stratigraphy
Abstract This paper presents an experimental and numerical investigation on anisotropic permeability of coal in order to evaluate the effects of the anisotropic permeability variation on CO sequestration in coal and CO-sequestration enhanced coalbed methane (CO-ECBM) recovery from coal seams. An alternative permeability model has been developed to improve reservoir simulation for CO sequestration in coal and coalbed methane (CBM) recovery and provide better understanding of the CO-ECBM process. Combined with experimental observations, the permeability model adopts a discontinuum medium approach, by which coal is treated as a discontinuum medium containing anisotropic matrixes and cleats. The permeability variations and anisotropic permeability ratios under isotropic net stresses were tested with relatively large coal samples to provide experimental information for model parameterization and validation. The model was further incorporated into a 3D coal reservoir model for reservoir simulations to investigate the impact of the anisotropic permeability of coal on coalbed methane (CBM) recovery. The simulations show good agreements with the experimental data, revealing that the developed model is superior for describing stress- and sorption-induced permeability variations in coals compared with commonly used permeability models that treat coal as isotropic media and use constant values for stress-dependent parameters. The results suggest that anisotropic permeability has significant effects on gas production and CO breakthrough time, implying that it is a critical parameter in determining well pattern and orientation of horizontal wells.
Formatted abstract
This paper presents an experimental and numerical investigation on anisotropic permeability of coal in order to evaluate the effects of the anisotropic permeability variation on CO2 sequestration in coal and CO2-sequestration enhanced coalbed methane (CO2-ECBM) recovery from coal seams. An alternative permeability model has been developed to improve reservoir simulation for CO2 sequestration in coal and coalbed methane (CBM) recovery and provide better understanding of the CO2-ECBM process.

Combined with experimental observations, the permeability model adopts a discontinuum medium approach, by which coal is treated as a discontinuum medium containing anisotropic matrixes and cleats. The permeability variations and anisotropic permeability ratios under isotropic net stresses were tested with relatively large coal samples to provide experimental information for model parameterization and validation. The model was further incorporated into a 3D coal reservoir model for reservoir simulations to investigate the impact of the anisotropic permeability of coal on coalbed methane (CBM) recovery. The simulations show good agreements with the experimental data, revealing that the developed model is superior for describing stress- and sorption-induced permeability variations in coals compared with commonly used permeability models that treat coal as isotropic media and use constant values for stress-dependent parameters. The results suggest that anisotropic permeability has significant effects on gas production and CO2 breakthrough time, implying that it is a critical parameter in determining well pattern and orientation of horizontal wells.
Keyword CO2 sequestration
Coal
Coalbed methane (CBM)
Permeability
Permeability anisotropy
Reservoir simulation
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP110103229
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
School of Chemical Engineering Publications
Official 2016 Collection
 
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