期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 15, 期 -, 页码 38-52出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2013.09.002
关键词
Coal permeability; Gas sorption; Coal swelling; Coal-gas interaction; Local heterogeneity
资金
- University of Queensland
- UWA-UQ BRCA grant
- Chinese National Science Foundation [51104147]
Coal permeability models based on constrained conditions such as constant volume theory can successfully match unconstrained experimental data and field observations. However, these models have a boundary mismatch because the boundary of permeability models is constrained while experiment boundary is free displacement or unconstrained. What the mechanism is to require such a boundary mismatch has not been well understood. In this study, a full coupled approach was developed to explicitly simulate the interactions of coal matrixes and fractures. In this model, a matrix-fracture model is numerically investigated after incorporating heterogeneous distributions of Young's modulus, Langmuir strain constant in the vicinity of the fracture. The impact of these local heterogeneities of coal mechanical and swelling properties on the permeability evolution is explored. The transient permeability evolution during gas swelling process is investigated and the difference between the final equilibrium permeability and transient permeability is compared. With the heterogeneity assumption, a net reduction of coal permeability is achieved from the initial no-swelling state to the final equilibrium state. This net reduction of coal permeability increases with the fracture (injection) pressure and is in good agreement with laboratorial data under the unconstrained swelling conditions. Coal local heterogeneity in vicinity of fracture can therefore be the mechanism of the above mismatch. (C) 2013 Elsevier B.V. All rights reserved.
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