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Real-time monitoring of induced strain during multi-stage ad-/desorption of methane on coal

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Abstract

The sorption-induced strain of coal is very important for the evaluation of coalbed methane productivity. Previous studies have focused on the strain properties of the equilibrium state, however, the time-dependent strain evolution behavior has been rarely considered. In this paper, to explore the time-dependent strain evolution behavior and the mechanism behind, we perform the real-time monitoring of induced strain during multi-stage sorption of methane on coal. The results show the multi-scale pore structure and the heterogeneous interface properties of coal determine the kinetics behavior of gas transport and sorption, which then dominates the time-dependent strain evolution properties. Single-stage sorption and multi-stage sorption are driven by high pressure and low pressure to complete continuous and discontinuous strain evolution, respectively. This differences in driving pressure and strain continuity have potential effects on strain kinetics. This study has potential implications for time-dependent production assessment of coalbed methane.

Article Highlights

  • Multi-stage ad-/desorption-induced strains are compared;

  • Influence of multi-stage on strain kinetics is analyzed.

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Acknowledgements

The authors are grateful to the financial support from the Guizhou Scientific Support Project (2021 General 514) and the China Scholarship Council (202006430045). Thanks to all the reviewers and editors for their work.

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Authors and Affiliations

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

    Min Hao, Chengwu Li, Yilin Wang & Heng Zhang

  2. Department of Mechanical Engineering, National University of Singapore, Singapore, 117574, Singapore

    Min Hao

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  1. Min Hao
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  2. Chengwu Li
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  3. Yilin Wang
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  4. Heng Zhang
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Correspondence to Min Hao or Chengwu Li.

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Hao, M., Li, C., Wang, Y. et al. Real-time monitoring of induced strain during multi-stage ad-/desorption of methane on coal. Geomech. Geophys. Geo-energ. Geo-resour. 8, 197 (2022). https://doi.org/10.1007/s40948-022-00514-y

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