Reservoir Evaluation and Development ›› 2022, Vol. 12 ›› Issue (4): 604-616.doi: 10.13809/j.cnki.cn32-1825/te.2022.04.008

• Methodological and Theory • Previous Articles     Next Articles

Hydraulic fracture extension characteristics of fractured formation based on phase field method

YI Liangping1(),ZHANG Dan2(),YANG Ruoyu3,XIAO Jialin4,LI Xiaogang2,YANG Zhaozhong2   

  1. 1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    3. Exploration Division of PetroChina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610041, China
    4. Institute of Engineering and Technology, Sinopec Jianghan Oilfield Company, Wuhan, Hubei 430035, China
  • Received:2021-10-22 Online:2022-08-26 Published:2022-09-02
  • Contact: ZHANG Dan;


Based on the theory of phase field method, a model of fracture propagation in porous elastic formation is established. In the proposed model, the fluid flow in the porous rock obeys Darcy’s seepage law, and the permeability of rock is anisotropic and a function of the maximum principal strain. The convergence of the model is verified by comparing the results of three different time steps cases. Meanwhile, based on the proposed model, the effects of the in-situ stress difference, intersection angle, injection rate, and fracturing fluid viscosity on the intersection behaviour of hydraulic and natural fractures are investigated. The results indicate that: ① The hydraulic fracturing can solely make one side of the natural fracture open; ② The smaller the intersection angle and in-situ stress difference, the easier the hydraulic fracture is to open the natural fracture; ③ Increasing injection rate is beneficial to completely open the natural fractures, therefore, in the process of fracturing construction, the construction displacement should be increased as much as possible under the conditions of wellhead equipment and underground string strength; ④ The injection pressure increases with the increase of injection rate and fluid viscosity. Finally, the reliability of this model is verified by comparing the simulation results of this model with those of previous laboratory experiments.

Key words: phase-field method, hydraulic fracture, fracture propagation, natural fracture, porous media

CLC Number: 

  • TE357