Effects of Water and scCO(2) Injection on the Mechanical Properties of Granite at High Temperatures

doi:10.1155/2020/8838989

	Effects of Water and scCO(2) Injection on the Mechanical Properties of Granite at High Temperatures
	Shen, Nao 1,3; Zhang, Qiang 2; Li, Xiaochun 1; Bai, Bing 1; Hu, Haixiang 1
刊名	ADVANCES IN CIVIL ENGINEERING
	2020-12-22
卷号	2020 页码:14
ISSN号	1687-8086
DOI	10.1155/2020/8838989
英文摘要	Geothermal energy is an important resource to substitute for traditional fossil fuels. The mechanical properties of reservoir rock under the conditions of water and scCO(2) injection at different temperatures are crucial for the safety of Enhanced Geothermal Systems. However, the effects of working fluid on the mechanical properties of granite at in situ temperatures are still rarely reported. To reveal the impact mechanisms, conventional triaxial compression experiments were conducted on granite specimens with different confining pressures (2-20 MPa), different pore fluid (10 MPa water or CO2), and different temperatures (25-150 degrees C) in the present study. SEM analyses were applied to the specimens to determine failure surface morphologies after the experiments. The experimental results show that the effective confining pressure, pore fluid, and temperature have significant effects on the strength of granite specimens. The strength of granite increases with the increase of effective confining pressure, with similar granite strength under the same effective confining pressure (dry, water, and CO2). Temperature strengthening of granite is limited by high confining pressure (similar to 15 MPa). Under the effective confining pressure of 5 MPa, temperature weakening occurs on granite specimens when temperature is higher than 90 degrees C. There is fluid diffusion in the specimens during compression. The higher viscosity of water may cause a temporary decrease in effective confining pressure, which may increase the strength of granite. The growth or formation of cracks is mainly observed in quartz and feldspar grains without short-term chemical effects. More visible cracks are observed on the specimens and more volume of fluid is injected under CO2 injection conditions, which may be beneficial to increase the permeability of geothermal reservoir.
资助项目	National Natural Science Foundation of China[41672252] ; National Key R&D Program of China[2016YFB0600805]
WOS研究方向	Construction & Building Technology ; Engineering
语种	英语
出版者	HINDAWI LTD
WOS记录号	WOS:000607930600007
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25593]
专题	中科院武汉岩土力学所
通讯作者	Li, Xiaochun
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Powerchina Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Shen, Nao,Zhang, Qiang,Li, Xiaochun,et al. Effects of Water and scCO(2) Injection on the Mechanical Properties of Granite at High Temperatures[J]. ADVANCES IN CIVIL ENGINEERING,2020,2020:14.
APA	Shen, Nao,Zhang, Qiang,Li, Xiaochun,Bai, Bing,&Hu, Haixiang.(2020).Effects of Water and scCO(2) Injection on the Mechanical Properties of Granite at High Temperatures.ADVANCES IN CIVIL ENGINEERING,2020,14.
MLA	Shen, Nao,et al."Effects of Water and scCO(2) Injection on the Mechanical Properties of Granite at High Temperatures".ADVANCES IN CIVIL ENGINEERING 2020(2020):14.