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• 页岩气 •

### 双井同步压裂裂缝扩展规律离散元模拟

1. 西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500
• 收稿日期:2022-08-08 出版日期:2023-10-26 发布日期:2023-11-01
• 通讯作者: 刘向君（1969—），女，博士，教授，博士生导师，从事岩石力学力学与井壁稳定方面研究。地址：四川省成都市新都区新都大道8号西南石油大学，邮政编码：610500。E-mail: liuxj@swpu.edu.cn
• 作者简介:张家伟（1995—），男，在读硕士研究生，从事岩石力学方面与井壁稳定研究。地址：四川省成都市新都区新都大道8号西南石油大学，邮政编码：610500。E-mail: zhangjwsw@qq.com
• 基金资助:
西南石油大学青年科技创新团队项目“非常规地层岩石物理”(2018CXTD13)

### Discrete element simulation study on fracture propagation law of dual well synchronous fracturing

ZHANG Jiawei(),LIU Xiangjun(),XIONG Jian,LIANG Lixi,REN Jianfei,LIU Baiqu

1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
• Received:2022-08-08 Online:2023-10-26 Published:2023-11-01

Abstract:

The understanding of fracture propagation and evolution during dual well synchronous hydraulic fracturing, particularly under various conditions, remains limited. Meanwhile, the interaction between fractures will cause fracture reorientation and affect the hydraulic fracturing effect. In order to solve these problems, the fracture propagation law and failure mode under the influence of different factors are studied by the discrete element method. The results show that when the angle between the interwell connecting line and the maximum principal stress （θ） is 0°, and under the influence of the horizontal stress difference, the stress around the borehole wall can be divided into two stages: the stable stage before the fracture intersection and the steep rise stage after the fracture intersection. With the decrease of the horizontal principal stress difference, the failure mode changes from single fracture to multi fracture failure. When θ≠0°, the in-situ stress field of the formation changes, which causes the fracture deflection and forms an inclined fracture connecting the two wells. During the fracturing process, the expansion of the fracture exerts great stress on the surrounding area, and the magnitude and direction of local stress state change due to the expansion of the main fracture. So that the crack spreads away from the direction of the maximum principal stress.

• TE357