Numerical Investigation of Influence of Fluid Rate, Fluid Viscosity, Perforation Angle and NF on HF Re-Orientation in Heterogeneous Rocks Using UDEC T-W Method

IR (HANDLE) Open Access
  • Zhang, Shuai
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology
  • Xu, Jinhai
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology
  • Chen, Liang
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology
  • Zhang, Mingwei
    State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology
  • Sasaoka, Takashi
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • Shimada, Hideki
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • He, Haiyang
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology

Description

Numerical simulation is very useful for understanding the hydraulic fracture (HF) re-orientation mechanism from artificial weaknesses. In this paper, the UDEC T-W (Trigon–Weibull distribution) modeling method is adopted to simulate the hydraulic fracturing process in heterogeneous rocks. First, the reliability of this method is validated against previous laboratory experiments and numerical simulations. Then the effects of fluid rate, fluid viscosity, perforation angle and natural fracture (NF) on the HF re-orientation process in heterogeneous rocks are studied independently. The results show that the HF re-orientation process depends on the combined effect of these factors. The HF re-orientation distance increases significantly, the final HF re-orientation trajectory becomes more complex and the guiding effect of perforation on the HF propagation path is more evident with the increase of fluid rate, fluid viscosity, and perforation angle if the hydraulic fracturing is performed in relatively heterogeneous rocks, while the differential stress is the main influencing factor and is more likely to dictate the HF propagation path if the rocks become relatively homogeneous. However, increasing the fluid viscosity and fluid rate can attenuate the impact of differential stress and can promote HF propagation along the perforation direction. Besides, NFs are also the important factor affecting HF re-orientation and induce secondary HF re-orientation in some cases in heterogeneous rocks.

Journal

  • machines

    machines 10 (2), 152-, 2022-02-18

    Multidisciplinary Digital Publishing Institute : MDPI

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Details 詳細情報について

  • CRID
    1050298532703736448
  • ISSN
    20751702
  • HANDLE
    2324/4798520
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB

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