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A New Permeability Model Under the Influence of Low-Frequency Vibration on Coal: Development and Verification

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Abstract

Reasonable use of different types of low-frequency vibration can better improve the production of coalbed methane (CBM). To understand the gas transport properties under low-frequency vibration in coal, a new permeability model of CBM reservoirs was proposed in this study. This model takes into account the deformation of coal matrix and fractures caused by vibration stress, gas adsorption and effective stress. In addition, an experimental system of low-frequency vibration was built to explore the influences of low-frequency vibration on permeability of coal samples. The experimental results were compared with theoretical permeability values to verify the reliability of proposed permeability model. Finally, a series of sensitivity analyses were conducted to identify key vibration parameters to the permeability of CBM reservoir. The results showed that the vibration time, vibration force and vibration frequency have significant effects on permeability of CBM reservoirs. The longer vibration time and the higher vibration force caused the greater damage of coal, resulting in the increase of permeability. However, with the increase of vibration frequency, coal permeability growth rate of coal first increases and then decreases, and a better permeability enhancement is observed near the resonant frequency. The experimental results indicate that the permeability growth rate of bituminous coal and anthracite coal is the highest at 25 Hz, reaching 371.8% and 268.5%, respectively. These results are expected to provide theoretical guidance for employing the low-frequency vibration to improve the gas extraction rate.

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The data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No.: 51974109, 52274191), Project funded by China Postdoctoral Science Foundation (2021M700132), Basic Research Funds of Henan Polytechnic University (NSFRF210301, NSFRF220205), and the Doctoral Fund of Henan Polytechnic University (B2019-55).

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JW: Conceptualization, Methodology, Writing-review & editing. YR: Validation, Formal analysis, Data analysis, Writing-original draft preparation. ZW: Resources, Visualization, Software, Investigation. LZ: Writing-review & editing. WJ: Writing-review & editing.

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Correspondence to Yongjie Ren or Zhihui Wen.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Wei, J., Ren, Y., Wen, Z. et al. A New Permeability Model Under the Influence of Low-Frequency Vibration on Coal: Development and Verification. Transp Porous Med 145, 761–787 (2022). https://doi.org/10.1007/s11242-022-01874-5

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  • DOI: https://doi.org/10.1007/s11242-022-01874-5

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