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Desorption Strain Kinetics of Gas-Bearing Coal based on Thermomechanical Diffusion–Seepage Coupling

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Abstract

The characteristics of coal desorption strain play a crucial role in coal permeability, coalbed methane (CBM) recovery, and the prevention of outbursts. This study developed an improved thermomechanical diffusion–seepage (TMDS) coupling model to investigate the strain evolution during the gas desorption process in coal. The model considers the time-varying diffusion coefficient, the Klinkenberg permeability effect, and the impact of moisture on adsorption, amending the traditional coal deformation equation and coal permeability model. Utilizing this model, the study explored the mechanism, contribution, and spatiotemporal evolution of desorption strain, while analyzing quantitatively the effects of gas types and TMDS parameters on the dynamics of desorption strain. The results demonstrate that desorption strain consists of fracture pressure, matrix pressure, desorption action, and temperature effects, with desorption action being the predominant factor. The impact of gas type, especially CO2, on desorption strain is significant, with CO2 enhancing CH4 desorption strain more than N2. Additionally, the study explored the sensitivity of desorption strain to TMDS parameters, revealing that gas pressure, permeability, and Langmuir pressure significantly impact desorption strain. Desorption strain can serve as an indicator for predicting and evaluating the risk of outbursts, and the injection of low-temperature liquid nitrogen could help reduce this risk. This research provides insights for further understanding the desorption mechanism in gas-bearing coal, improving CBM recovery, and preventing disasters.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (52004292), and the Guizhou Scientific Support Project (2023 General 430).

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Authors and Affiliations

  1. School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing, 100083, China

    Chengmin Wei, Chengwu Li, Zhenfei Li, Mingjie Li & Yifan Yin

  2. Jiangsu Key Laboratory of Urban and Industrial Safety, Nanjing Tech University, Nanjing, 211816, China

    Min Hao

  3. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, China

    Min Hao

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  1. Chengmin Wei
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Correspondence to Chengwu Li or Min Hao.

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Wei, C., Li, C., Li, Z. et al. Desorption Strain Kinetics of Gas-Bearing Coal based on Thermomechanical Diffusion–Seepage Coupling. Nat Resour Res (2024). https://doi.org/10.1007/s11053-024-10346-0

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