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Research on Coal Thermo-Hydro-Mechanical Coupling Model and Influence Factors

  • Xi Yu
  • Yuanzhao Jia
  • Donghe Yu
  • Guohua Liu
  • Ning Li
  • Zhiguo Zeng
  • Donglei Li
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

In the coal cryogenic volume fracturing, the variations of temperature field, seepage field, and stress field of coal are the foundation to study fracture propagation in the condition of cryogenic injection. Taking 3# high-rank coal sample from Jincheng City of Shanxi Province as study object, based on coal mechanics tests and permeability tests in complete stress–strain process under cryogenic conditions, a thermo-hydro-mechanical coupling mode is introduced under the condition of low-temperature phase change and a THM coupling numerical model of high-rank coal is established. The effect of different treatment parameters, porosity, permeability, thermodynamic parameters, and coal cleat on temperature field, seepage field, and stress field during the cryogenic volume fracturing is simulated. The results show that the temperature field is mainly subjected to the influence of treatment parameters, porosity and permeability, and thermodynamic parameters of coal. As for the seepage field, it suffers the influence of both injection and mechanical parameters. In addition, the stress field is principally affected by treatment parameters, permeability, and modulus of elasticity. Additionally, cleat that exists is also able to substantially increase the influence area of cryogenic fluids on three fields mentioned above.

Keywords

THM Temperature field Seepage field Stress field Influence factors 

Notes

Acknowledgements

The financial support for this research was provided by the engineering technology research institute of Huabei oilfield, and is greatly appreciated. Also, the author would like to thank the input from Mr. Yu. Last, I give my most sincere love to my family, their company is the biggest encouragement for me.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Xi Yu
    • 1
  • Yuanzhao Jia
    • 2
  • Donghe Yu
    • 2
  • Guohua Liu
    • 2
  • Ning Li
    • 2
  • Zhiguo Zeng
    • 2
  • Donglei Li
    • 3
  1. 1.Research Center of China United Coalbed Methane Co. Ltd.BeijingChina
  2. 2.Engineering Technology Research Institute of Huabei Oilfield Co.Renqiu, HebeiChina
  3. 3.No. 2, Mud Logging Company, Bohai Drilling Engineer Company LimitedTianjinChina

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