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Numerical Simulation Study on the Evolution Law of Stress and Crack in Coal Seam Hydraulic Fracturing

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  • Shouguo Yang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    State Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Ning Xu

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Xiaofei Zhang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

Hydraulic fracturing as a conventional reservoir permeability enhancement technique can effectively increase the production of coalbed methane, and it is important to study the stress and crack evolution law to evaluate the effect of coalbed fracturing and optimize the construction process. To accurately derive the evolution characteristics of stress and the propagation form of cracks during hydraulic fracturing of coal seams, a numerical model of hydraulic fracturing was established based on a three-point bending test of coal samples using the finite-discrete element method (FDEM). Based on a coal seam in a mining area in southwest China, a hydraulic fracturing model was established, and the reliability of the numerical model was verified by comparing the numerical simulation with the analytical expression. The model was used to study the evolution of stress and cracks with time during hydraulic fracturing, and the influence of elastic modulus and permeability on the evolution of stress and cracks was investigated. The results show that stress and cracks in the process of hydraulic fracturing belong to a mutual feeding mechanism during evolution, and the effective permeability range of fracturing is an ellipse with the crack as the long axis enclosed by the effective stress field. The greater the elastic modulus of the coal seam, the greater the crack initiation pressure and the shorter the crack initiation time, and a coal seam with a high elastic modulus is more likely to form complex cracks. The change in coal seam permeability has little effect on the initiation pressure and initiation time, but the crack propagation path is obviously different, and a coal seam with low permeability is more favorable to hydraulic fracturing.

Suggested Citation

  • Shouguo Yang & Ning Xu & Xiaofei Zhang, 2023. "Numerical Simulation Study on the Evolution Law of Stress and Crack in Coal Seam Hydraulic Fracturing," Sustainability, MDPI, vol. 15(14), pages 1-13, July.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:14:p:11351-:d:1199166
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    References listed on IDEAS

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    1. Yakang Li & Jiangwei Liu & Qian Yu, 2022. "Patterns of Influence of Parallel Rock Fractures on the Mechanical Properties of the Rock–Coal Combined Body," Sustainability, MDPI, vol. 14(20), pages 1-17, October.
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    4. Peibo Li & Jianguo Wang & Wei Liang & Rui Sun, 2023. "An Analytical and Numerical Analysis for Hydraulic Fracture Propagation through Reservoir Interface in Coal-Measure Superimposed Reservoirs," Sustainability, MDPI, vol. 15(5), pages 1-34, March.
    5. Liu, Shumin & Sun, Haitao & Zhang, Dongming & Yang, Kun & Li, Xuelong & Wang, Dengke & Li, Yaning, 2023. "Experimental study of effect of liquid nitrogen cold soaking on coal pore structure and fractal characteristics," Energy, Elsevier, vol. 275(C).
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