Coupled Thermo-Hydro-Mechanical Modeling of Hydro-Shearing Stimulation in an Enhanced Geothermal System in the Raft River Geothermal Field, USA

doi:10.1007/s00603-020-02227-8

	Coupled Thermo-Hydro-Mechanical Modeling of Hydro-Shearing Stimulation in an Enhanced Geothermal System in the Raft River Geothermal Field, USA
	Yuan, Yilong 2,3; Xu, Tianfu 2; Moore, Joseph 4; Lei, Hongwu 1; Feng, Bo 2
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2020-08-25
页码	18
关键词	Enhanced geothermal system Hydro-shearing Raft river geothermal field Thermo-hydro-mechanical modeling TOUGH2Biot
ISSN号	0723-2632
DOI	10.1007/s00603-020-02227-8
英文摘要	The Raft River Enhanced Geothermal System (EGS) demonstration project aims to improve the geothermal production by enhancing the reservoir permeability via shear stimulation in well RRG-9. In this paper, we performed a series of 3D thermo-hydro-mechanical (THM) simulations to investigate the influence of hydraulic and thermal effects on the development of this EGS. The model includes synthetic fracture populations based on borehole televiewer images and in-situ stress measurements from well RRG-9. Fracture permeability evolution is determined using an empirical permeability law developed from laboratory experiments. The model was calibrated by comparing the hydraulic response to field observations, including wellhead pressure, injection rate, and well injectivity. Particularly, we analyzed the enhancement of reservoir permeability and the spatial extent of the stimulation zone for the given injection schedule. Our results indicate that the permeability enhancement of fractured geothermal reservoir is caused by the combined effects of injection-induced cooling and fluid pressure increase. The decrease of temperature plays a dominant role in reactivation of natural fractures under the hydro-shearing mechanism, while the higher injection pressure promotes shear failure and enlarges the stimulation zone. For the specified extensional stress state, the model favors greatest permeability enhancement along the maximum horizontal principal stress, a moderate vertical enhancement, and a smaller gain along the minimum horizontal principal stress.
资助项目	National Key R&D Program of China[2018YFE0111300] ; China Postdoctoral Science Founded Project[2019M661213] ; Key Laboratory of Groundwater Resources and Environment and the Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000562653200001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/24750]
专题	中科院武汉岩土力学所
通讯作者	Feng, Bo
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China 2.Jilin Univ, Key Lab Groundwater Resources & Environm, Minist Educ, Changchun 130021, Peoples R China 3.Jilin Univ, Engn Res Ctr Geothermal Resources Dev Technol & E, Minist Educ, Changchun 130026, Peoples R China 4.Univ Utah, Energy & Geosci Inst, Salt Lake City, UT 84108 USA
推荐引用方式 GB/T 7714	Yuan, Yilong,Xu, Tianfu,Moore, Joseph,et al. Coupled Thermo-Hydro-Mechanical Modeling of Hydro-Shearing Stimulation in an Enhanced Geothermal System in the Raft River Geothermal Field, USA[J]. ROCK MECHANICS AND ROCK ENGINEERING,2020:18.
APA	Yuan, Yilong,Xu, Tianfu,Moore, Joseph,Lei, Hongwu,&Feng, Bo.(2020).Coupled Thermo-Hydro-Mechanical Modeling of Hydro-Shearing Stimulation in an Enhanced Geothermal System in the Raft River Geothermal Field, USA.ROCK MECHANICS AND ROCK ENGINEERING,18.
MLA	Yuan, Yilong,et al."Coupled Thermo-Hydro-Mechanical Modeling of Hydro-Shearing Stimulation in an Enhanced Geothermal System in the Raft River Geothermal Field, USA".ROCK MECHANICS AND ROCK ENGINEERING (2020):18.