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An Analytical and Numerical Analysis for Hydraulic Fracture Propagation through Reservoir Interface in Coal-Measure Superimposed Reservoirs

Author

Listed:
  • Peibo Li

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Jianguo Wang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
    School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Wei Liang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Rui Sun

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Hydraulic fracturing technology can be used to jointly exploit unconventional natural gas such as coalbed methane and tight sandstone gas in coal-measure superimposed reservoirs for the enhancement of natural gas production. Hydraulic fracturing usually induces mixed fractures of I and II modes, but existing studies have not considered the influence of reservoir lithology on the stress intensity factor of I/II mixed fractures in coal-measure superimposed reservoirs. This paper develops an analytical stress model and a seepage-mechanical-damage numerical model for the vertical propagation of I/II mixed fractures in coal-measure superimposed reservoirs. The variation of stress intensity factor of I/II mixed fractures is analyzed when the fractures are close to the interface of different lithologic reservoirs and the effects of elastic modulus difference, stress state, fracturing fluid viscosity, shear and tensile failure modes on the vertical propagation of hydraulic fractures are investigated. Finally, the ratio of elastic modulus of adjacent reservoirs is proposed as an evaluation index for the fracture propagation through reservoir interface. These investigations revealed that hydraulic fracture propagation through the reservoir interface is a process of multi-physical interactions and is mainly controlled by the injection pressure and the elastic modulus ratio of adjacent reservoirs. A critical line is formed in the coordinates of elastic modulus ratio and injection pressure. A fracture can propagate through the reservoir interface when the combination of injection pressure and the elastic modulus ratio is in the breakthrough zone. These results can provide theoretical support for the site selection of horizontal wells in coal-measure gas exploitation.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:5:p:4597-:d:1087616
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    References listed on IDEAS

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    1. Fuchun Tian & Yan Jin & Fengming Jin & Xiaonan Ma & Lin Shi & Jun Zhang & Dezhi Qiu & Zhuo Zhang, 2022. "Multi-Fracture Synchronous Propagation Mechanism of Multi-Clustered Fracturing in Interlayered Tight Sandstone Reservoir," Sustainability, MDPI, vol. 14(14), pages 1-18, July.
    2. Xiangxiang Zhang & Jianguo Wang & Feng Gao & Xiaolin Wang, 2018. "Numerical Study of Fracture Network Evolution during Nitrogen Fracturing Processes in Shale Reservoirs," Energies, MDPI, vol. 11(10), pages 1-22, September.
    3. Jianming He & Chong Lin & Xiao Li & Xiaole Wan, 2016. "Experimental Investigation of Crack Extension Patterns in Hydraulic Fracturing with Shale, Sandstone and Granite Cores," Energies, MDPI, vol. 9(12), pages 1-16, December.
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    Cited by:

    1. Fuqing Li & Fufeng Li & Rui Sun & Jianjie Zheng & Xiaozhao Li & Lan Shen & Qiang Sun & Ying Liu & Yukun Ji & Yinhang Duan, 2024. "A Study on the Transient Response of Compressed Air Energy Storage in the Interaction between Gas Storage Chambers and Horseshoe-Shaped Tunnels in an Abandoned Coal Mine," Energies, MDPI, vol. 17(4), pages 1-15, February.
    2. Weihua Chen & Jian Yang & Li Li & Hancheng Wang & Lei Huang & Yucheng Jia & Qiuyun Hu & Xingwen Jiang & Jizhou Tang, 2023. "Investigation of Mechanical Properties Evolution and Crack Initiation Mechanisms of Deep Carbonate Rocks Affected by Acid Erosion," Sustainability, MDPI, vol. 15(15), pages 1-17, August.
    3. 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.

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