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Impact of dynamic swelling increment factor on coal permeability

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Abstract

Although the permeability model has been studied for many years, the effect of adsorption strain has not been well explained. In this study, a new permeability model including a swelling increment factor (SIF) is proposed. The SIF expressed by the physical parameters and pressure affects the evolution of permeability. The permeability model consists of three parts: the matrix strain of effective stress, the fracture strain of effective stress, and the adsorption strain of coal. It is found that gas adsorption makes a big contribution to the evolution of permeability. Three different forms of the permeability model are derived such as constant volume condition, constant confining stress, and uniaxial strain condition. The permeability model considered the SIF fits the experiment and field data well. The permeability model can be widely used in different conditions to explain the mechanism of permeability in matrix-fracture and the adsorption strain relationship among fracture, matrix, and coal bulk.

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Authors and Affiliations

  1. The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, China

    Yi Hu

  2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China

    Haizeng Pan, Yong Kang, Hao Chen, Miao Yuan & Feng Liu

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  1. Haizeng Pan
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  2. Yi Hu
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  3. Yong Kang
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  4. Hao Chen
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  5. Miao Yuan
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  6. Feng Liu
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Correspondence to Yi Hu.

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Responsible Editor: Santanu Banerjee

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Pan, H., Hu, Y., Kang, Y. et al. Impact of dynamic swelling increment factor on coal permeability. Arab J Geosci 14, 1652 (2021). https://doi.org/10.1007/s12517-021-08091-2

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