TY - JOUR
T1 - Effect of adsorption-induced matrix swelling on coal permeability evolution of micro-fracture with the real geometry
AU - Wei, Ming Yao
AU - Liu, Jishan
AU - Liu, Ying Ke
AU - Liu, Zhang Hao
AU - Elsworth, Derek
N1 - Funding Information:
This work was supported by National Key Research and Development Program of China ( 2020YFA0711802 ), the China Postdoctoral Science Foundation ( 2019M661997 ), the National Natural Science Foundation of China ( 51774277 ), the Australian Research Council under Grant ( DP200101293 ), the Science and Technology Major Project of Shanxi Province, China ( 20201102001 ) and the Open Fund of State Key Laboratory of Coal and CBM Co-Mining ( 2018KF09 ). These sources of support are gratefully acknowledged.
Publisher Copyright:
© 2021 The Authors
PY - 2021/8/15
Y1 - 2021/8/15
N2 - Gas transport in coal induces effective stress variation, matrix swelling/shrinkage, and significantly affects matrix and fracture deformation, resulting in porosity and permeability evolution. However, the heterogeneity and anisotropy of coal are neglected in dual porosity models, which can lead to the deviation from the real physical mechanisms. To uncover the permeability evolution, especially the influence of dynamic matrix-fracture interaction for real fracture distribution, advanced virtual simulation is proposed. In this study, real fracture geometry is taken into account in the physical model based on the CT-scan image, while the mathematical models for coal deformation and gas flow are established. Our calculations are verified against a long-term experimental data under the same boundary condition. Accordingly, the real matrix-fracture interaction caused by adsorption-induced matrix deformation has been visually exhibited, and some new insight into the behavior of fracture permeability in real materials is offered. The results indicate the non-uniform distribution of fracture geometry is responsible for the nonmonotonic change of permeability. It also found that injection pressure, Langmuir strain constant and initial matrix permeability have important influences on the fracture permeability evolution. This research provides valuable insight into the understanding of the permeability change for the real fracture spatial distribution in coal.
AB - Gas transport in coal induces effective stress variation, matrix swelling/shrinkage, and significantly affects matrix and fracture deformation, resulting in porosity and permeability evolution. However, the heterogeneity and anisotropy of coal are neglected in dual porosity models, which can lead to the deviation from the real physical mechanisms. To uncover the permeability evolution, especially the influence of dynamic matrix-fracture interaction for real fracture distribution, advanced virtual simulation is proposed. In this study, real fracture geometry is taken into account in the physical model based on the CT-scan image, while the mathematical models for coal deformation and gas flow are established. Our calculations are verified against a long-term experimental data under the same boundary condition. Accordingly, the real matrix-fracture interaction caused by adsorption-induced matrix deformation has been visually exhibited, and some new insight into the behavior of fracture permeability in real materials is offered. The results indicate the non-uniform distribution of fracture geometry is responsible for the nonmonotonic change of permeability. It also found that injection pressure, Langmuir strain constant and initial matrix permeability have important influences on the fracture permeability evolution. This research provides valuable insight into the understanding of the permeability change for the real fracture spatial distribution in coal.
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U2 - 10.1016/j.petsci.2021.07.006
DO - 10.1016/j.petsci.2021.07.006
M3 - Article
AN - SCOPUS:85117285193
SN - 1672-5107
VL - 18
SP - 1143
EP - 1152
JO - Petroleum Science
JF - Petroleum Science
IS - 4
ER -