Anisotropic permeability model for coal containing methane based on anisotropic structure ratio

The coal permeability is the key parameter for the gas seepage characteristics and the migration law, and the structural anisotropy of the coal seam makes the permeability have obvious orientation dependence. By assumeing that the coal structure is anisotropic, an anisotropic permeability model is d...

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Bibliographic Details
Published inYantu Gongcheng Xuebao = Chinese Journal of Geotechnical Engineering Vol. 39; no. 6; p. 1030
Main Authors Qi, Xian-yin, Wang, Wei
Format Journal Article
LanguageChinese
Published Nanjing Nanjing Hydraulic Research Institute 01.06.2017
Subjects
Anisotropy
Coal
Confining
Gaseous diffusion
Mathematical models
Parameters
Permeability
Seepage
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Summary:The coal permeability is the key parameter for the gas seepage characteristics and the migration law, and the structural anisotropy of the coal seam makes the permeability have obvious orientation dependence. By assumeing that the coal structure is anisotropic, an anisotropic permeability model is deduced using anisotropic structure ratio for the key parameters, and the Comsol computing platform is implanted. The effects of coal anisotropy on gas diffusion and penetration are investigated. The theoretical and numerical results show that based on the comparative analysis of anisotropic permeability experiments, the proposed model is verified to be reasonable and used for different conditions. There is an exponential relationship between the anisotropic structure ratio and the permeability ratio of the parallel direction of bedding plane to the vertical direction, in other words, the larger the anisotropic structure ratio, the greater the permeability ratio of the parallel direction of bedding plane to the vert
ISSN:1000-4548
DOI:10.11779/CJGE201706008