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Effect of In-Situ Stress on Hydraulic Fracturing of Tight Sandstone Based on Discrete Element Method

Author

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  • Hongjian Wang

    (North China University of Water Resources and Electric Power, Zhengzhou 450045, China
    Key Laboratory of Geological Environment Intelligent Monitoring and Disaster Prevention and Control of Henan Province, Zhengzhou 450045, China)

  • Wanlin Gong

    (North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

  • Guangxiang Yuan

    (North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

  • Xiaodong Wang

    (North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

  • Jitao Zhao

    (SCIVIC Engineering Corporation, Luoyang 471000, China)

  • Yujie Su

    (North China University of Water Resources and Electric Power, Zhengzhou 450045, China
    Key Laboratory of Geological Environment Intelligent Monitoring and Disaster Prevention and Control of Henan Province, Zhengzhou 450045, China)

  • Yuchen Wang

    (North China University of Water Resources and Electric Power, Zhengzhou 450045, China
    Key Laboratory of Geological Environment Intelligent Monitoring and Disaster Prevention and Control of Henan Province, Zhengzhou 450045, China)

Abstract

The tight sandstone reservoir in the Qianfoya formation of well PL-3 of the Puguang gas field in Sichuan, China, obtained a high-yield gas flow after a volume fracturing treatment. However, the stimulated reservoir volume (SRV), fracture morphology, scale and formation law still remain unclear. Based on particle flow discrete-element theory in this paper, we carried out a few trials of the Brazilian splitting test, uniaxial compression and triaxial compression of rock mechanics. Meanwhile, the research also testified to the conversion relationship between macroparameters and microparameters, established the numerical simulation on hydraulic fracturing through PFC 2D discrete element software, and finally analyzed the influence of difference coefficients on the fracturing effect, in terms of different in-situ stresses. The conclusions are as follows: firstly, the influence of in-situ stress is essential for the direction, shape and quantity of fracture propagation, and the fractures generated by hydraulic fracturing are mainly tension fractures, accounting for over 90% of the total longitudinal fractures. Secondly, it is indicated that when the difference coefficient is small in the in-situ stress, the fractures formed by hydraulic fracturing expand randomly around the wellbore. When the difference coefficient K h of in-situ stress is above 0.6, the development of hydraulic fractures is mainly controlled by in-situ stress; as a result, the fractures tend to expand in the vertical direction of the minimum horizontal principal stress and the fracture shape is relatively singular. When the difference coefficient of in-situ stress was 0.3, in total, 3121 fractures were generated by fracturing, and the fractal dimension D value of the fracture network complexity was 1.60. In this case, this fracturing effect was the best and it is the easiest to achieve for the purpose of economical and effective development on large-scale volume fracturing.

Suggested Citation

  • Hongjian Wang & Wanlin Gong & Guangxiang Yuan & Xiaodong Wang & Jitao Zhao & Yujie Su & Yuchen Wang, 2022. "Effect of In-Situ Stress on Hydraulic Fracturing of Tight Sandstone Based on Discrete Element Method," Energies, MDPI, vol. 15(15), pages 1-13, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5620-:d:878854
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    References listed on IDEAS

    as
    1. Wei Meng & Chuan He, 2020. "Back Analysis of the Initial Geo-Stress Field of Rock Masses in High Geo-Temperature and High Geo-Stress," Energies, MDPI, vol. 13(2), pages 1-20, January.
    2. Jian Zhou & Luqing Zhang & Anika Braun & Zhenhua Han, 2017. "Investigation of Processes of Interaction between Hydraulic and Natural Fractures by PFC Modeling Comparing against Laboratory Experiments and Analytical Models," Energies, MDPI, vol. 10(7), pages 1-18, July.
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