A review of the research on the mechanism of hydro-shearing in geothermal reservoir

被引：0
|
作者：
Zhang H. [1 ,2 ]
Wan Z. [3 ,4 ]
Zhao Y. [1 ]
Zhang Y. [3 ]
Lu S. [3 ,4 ]
机构：
[1] Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology-Beijing, Beijing
[2] State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan
[3] Key Laboratory of Deep Coal Resource Mining(CUMT), Ministry of Education of China, China University of Mining & Technology, Xuzhou
[4] School of Mines, China University of Mining & Technology, Xuzhou
来源：
Meitan Xuebao/Journal of the China Coal Society | 2021年 / 46卷 / 10期
关键词：
Dry hot rock; Enhanced geothermal system; Failure mechanism; Hydro-shearing; Mechanism of hydro-shearing;
D O I：
10.13225/j.cnki.jccs.2020.1188
中图分类号：
学科分类号：
摘要：
In the enhanced geothermal system (EGS), a low-pressure water injection trigged rock fracture shear is a key technique to enhance the fluid conductivity and improve the heat extraction efficiency of geo-thermal reservoir. However, the mechanism of hydro-shearing under hydro-thermo-mechanical-chemical (HTMC) coupled conditions is extremely complex which has become a key issue for heat extraction and a hot topic for earthquake prevention and control in EGS. Furthermore, lots of new problems arise and many existing theories are no longer fully applicable under high temperature and high pressure (HTHP).This in turn requires that the theoretical innovation, experimental equipment development and engineering technique breakthroughs should be made to promote the progress of geothermal energy development. By reviewing the current research status of hydro-shearing mechanism, the authors focused on the topic of hydro-shearing mechanism of fractured rock mass under HTMC coupling and clarified some key scientific and technical problems including:① evolutions of the cohesive strength and internal friction under high temperatures; ② HTMC coupled effect on hydro-shearing criteria; ③ applicability and parameter optimization of effective stress theory; ④ dynamic failure response of hot-dry-rock fractures under hydro-shearing; ⑤ effect of thermal shock on hydro-shearing; and ⑥ the relationship between water injecting induced shearing and the possibility of induced earthquake, and potentials about releasing earthquake using hydro-shearing technique. By re-viewing the mechanism of hydro-shearing of the EGS reservoir, the authors would like to summarize and discuss the key scientific and technical problems, thus it may be helpful to have a comprehensive understanding of hydro-shearing and promote the application of the technique. © 2021, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：3172 / 3185
页数：13
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