Applied Mathematics and Mechanics (English Edition) ›› 2024, Vol. 45 ›› Issue (5): 911-930.doi: https://doi.org/10.1007/s10483-024-3113-9

• Articles • Previous Articles    

A phase-field model for simulating the propagation behavior of mixed-mode cracks during the hydraulic fracturing process in fractured reservoirs

Dan ZHANG1, Liangping YI1,2,*(), Zhaozhong YANG1, Jingqiang ZHANG3, Gang CHEN4, Ruoyu YANG5, Xiaogang LI1   

  1. 1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
    3 Tarim Oilfield Company, PetroChina, Bayingolin Mongolian Autonomous Prefecture 841000, Xinjiang Uygur Autonomous Region, China
    4 Wuqi Oil Production Plant, Shaanxi Yanchang Petroleum, Xi'an 716000, China
    5 Exploration Division of PetroChina Southwest Oil and Gasfield Company, Chengdu 610041, China
  • Received:2024-01-16 Online:2024-05-03 Published:2024-04-26
  • Contact: Liangping YI E-mail:ylpfrac@163.com
  • Supported by:
    the National Natural Science Foundation of China(42202314);Project supported by the National Natural Science Foundation of China (No. 42202314)

Abstract:

A novel phase-field model for the propagation of mixed-mode hydraulic fractures, characterized by the formation of mixed-mode fractures due to the interactions between fluids and solids, is proposed. In this model, the driving force for the phase field consists of both tensile and shear components, with the fluid contribution primarily manifesting in the tension driving force. The displacement and pressure are solved simultaneously by an implicit method. The numerical solution's iterative format is established by the finite element discretization and Newton-Raphson (NR) iterative methods. The correctness of the model is verified through the uniaxial compression physical experiments on fluid-pressurized rocks, and the limitations of the hydraulic fracture expansion phase-field model, which only considers mode Ⅰ fractures, are revealed. In addition, the influence of matrix mode Ⅱ fracture toughness value, natural fracture mode Ⅱ toughness value, and fracturing fluid injection rate on the hydraulic fracture propagation in porous media with natural fractures is studied.

Key words: mixed-mode crack, hydraulic fracturing, poro-elasticity, phase-field method (PFM)

2010 MSC Number: 

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