Research on Dynamic Change of Reservoir Permeability Based on Coupled Pore Fluid Flow and Stress Analysis

Han, Jie; Ma, Dudu; Ju, Yafeng; Zhao, Kai; Xu, Yuhong; Gao, S.W.

doi:10.1615/specialtopicsrevporousmedia.2018021224

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“…When the pore pressure is less than the critical value, the permeability of the coal seam is attenuated, and vice versa. Han et al studied the effect of temperature on the permeability of coal, and concluded that the permeability increases with the increase in temperature and has a positive exponential relationship. Gilman et al studied the effects of the ground stress and geoelectric field on CBM migration, and applied the basic principles of seepage theory to derive coalbed methane seepage equations considering the ground stress and geoelectric field.…”

Section: Introductionmentioning

confidence: 99%

Study on the change of permeability of gas‐containing coal under many factors

Wang

et al. 2019

Energy Science & Engineering

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The permeability characteristics of gas‐containing coal under different radial stress, different axial stress, and gas pressure were studied by orthogonal experiments, using a self‐developed three‐axis servo fluid infiltration system with a gas‐solid coupling of gas‐containing coal, on the basis of a single‐factor influence on the permeability of gas‐containing coal. By considering the effective stress, three kinds of relationships between permeability and radial stress, permeability and axial stress, as well as permeability and gas pressure were established. The results show that radial stress, axial stress, and gas pressure have a great influence on the permeability characteristics of gas‐containing coal: (a) The influence of radial stress on gas permeability is significant, whereas the influence of axial stress is negligible. The degree of influence of radial stress, gas pressure, and axial stress on the permeability decreases in turn; (b) The permeability decreases following a power function with the increase of the radial stress; (c) The permeability gradually increases with the increase of axial stress. With the increase of axial stress, the permeability increases following a power function; (d) The increase in gas pressure will reduce the effective stress on the coal, and the number of pores and cracks inside the coal body will decrease. This will increase the effective seepage flow and gas flow rate of the gas and eventually lead to the increase of coal permeability. There is a quadratic function relationship between the permeability and gas pressure.

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Section: Introductionmentioning

confidence: 99%

Study on the change of permeability of gas‐containing coal under many factors

Wang

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

Research on Dynamic Change of Reservoir Permeability Based on Coupled Pore Fluid Flow and Stress Analysis

Cited by 1 publication

References 0 publications

Study on the change of permeability of gas‐containing coal under many factors

Study on the change of permeability of gas‐containing coal under many factors

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