Crack Propagation Behavior of Carbonatite Geothermal Reservoir Rock Mass Based on Extended Finite Element Method

被引：2

作者：

Wang W. ^{[1
]}

Fu H. ^{[1
]}

Xing L. ^{[2
]}

Chai B. ^{[1
]}

Liu B. ^{[1
]}

Shi X. ^{[1
]}

机构：

[1] School of Environmental Studies, China University of Geosciences, Wuhan

[2] Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 10期

关键词：

Crack propagation; Extended finite element; Geothermal reservoir; Hydraulic fracturing; Numerical simulation;

D O I：

10.3799/dqkx.2021.005

中图分类号：

学科分类号：

摘要：

Hydraulic fracturing is one of the main geothermal energy exploitation methods, and its fracturing effect is not only related to the basic physical and mechanical properties of the rock mass, but also closely related to the distribution of fractures, the state of in-situ stress, and the engineering parameters of fracturing. To explore the influence of the above factors of the fracture propagation behavior in the process of hydraulic fracturing, in this paper it takes the carbonatite reservoir rock mass in Jizhong depression as the research object. Based on the extended finite element method, a fracture propagation fluid-solid coupling model is established and analyzed. The influence of parameters such as horizontal stress difference, perforation azimuth angle, injection fluid displacement, and fracturing fluid viscosity on fracture propagation behavior. The results show: When a single fracture propagates, the smaller the perforation azimuth angle and the larger the injection rate, the more conducive to fracture propagation. When double cracks propagate, the horizontal stress difference increases, and the degree of crack deflection decreases. When hydraulic fractures intersect with natural fractures, the smaller horizontal stress difference is beneficial to the opening of natural fractures. © 2021, Editorial Department of Earth Science. All right reserved.

引用

页码：3509 / 3519

页数：10

共 57 条

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