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Numerical Study of Elasto-Plastic Hydraulic Fracture Propagation in Deep Reservoirs Using a Hybrid EDFM–XFEM Method

Author

Listed:
  • Wenzheng Liu

    (Research Center of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Qingdong Zeng

    (Department of Mechanics, Shandong University of Science and Technology, Qingdao 266580, China)

  • Jun Yao

    (Research Center of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Ziyou Liu

    (Research Center of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Tianliang Li

    (Production Optimization R&D Institute of COSL, Tianjin 300459, China)

  • Xia Yan

    (Research Center of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

Rock yielding may well take place during hydraulic fracturing in deep reservoirs. The prevailing models based on the linear elastic fracture mechanics (LEFM) are incapable of describing the evolution process of hydraulic fractures accurately. In this paper, a hydro-elasto-plastic model is proposed to investigate the hydraulic fracture propagation in deep reservoirs. The Drucker–Prager plasticity model, Darcy’s law, cubic law and cohesive zone model are employed to describe the plastic deformation, matrix flow, fracture flow and evolution of hydraulic fractures, respectively. Combining the embedded discrete fracture model (EDFM), extended finite element method (XFEM) and finite volume method, a hybrid numerical scheme is presented to carry out simulations. A dual-layer iterative procedure is developed based on the fixed-stress split method, Picard iterative method and Newton–Raphson iterative method. The iterative procedure is used to deal with the coupling between nonlinear deformation with fracture extension and fluid flow. The proposed model is verified against analytical solutions and other numerical simulation results. A series of numerical cases are performed to investigate the influences of rock plasticity, internal friction angle, dilatancy angle and permeability on hydraulic fracture propagation. Finally, the proposed model is extended to simulate multiple hydraulic fracture propagation. The result shows that plastic deformation can enhance the stress-shadowing effect.

Suggested Citation

  • Wenzheng Liu & Qingdong Zeng & Jun Yao & Ziyou Liu & Tianliang Li & Xia Yan, 2021. "Numerical Study of Elasto-Plastic Hydraulic Fracture Propagation in Deep Reservoirs Using a Hybrid EDFM–XFEM Method," Energies, MDPI, vol. 14(9), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2610-:d:548119
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    Cited by:

    1. Wei Cui & Zhongmin Xiao & Jie Yang & Mi Tian & Qiang Zhang & Ziming Feng, 2022. "Multi-Crack Dynamic Interaction Effect on Oil and Gas Pipeline Weld Joints Based on VCCT," Energies, MDPI, vol. 15(8), pages 1-24, April.

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