Mechanical Behavior of Sandstone Pressurized with Supercritical CO2 and Water under Different Confining Pressure Conditions

doi:10.1061/(ASCE)GM.1943-5622.0002061

	Mechanical Behavior of Sandstone Pressurized with Supercritical CO2 and Water under Different Confining Pressure Conditions
	Zhang, Qiang 1; Ye, Wu 1; Chen, Yonghong 1; Li, Xiaochun 2; Hu, Shaobin 3
刊名	INTERNATIONAL JOURNAL OF GEOMECHANICS
	2021-07-01
卷号	21 期号:7 页码:11
关键词	CO2 geological storage Hydromechanical processes Compression strength CO2-H2O biphasic fluid Unsaturated rock
ISSN号	1532-3641
DOI	10.1061/(ASCE)GM.1943-5622.0002061
英文摘要	Understanding the mechanical behavior of a reservoir rock within the CO2-injection zone is essential for the safety of CO2 geological storage (CGS). The water saturation of the reservoir rock could be changed with the injection of huge amounts of supercritical CO2 (scCO(2)). Triaxial compression tests were performed on sandstone under dry, H2O-injected, scCO(2)-injected, and CO2-H2O biphasic conditions at effective confining pressures ranging from 10 to 50 MPa to investigate the mechanical behavior of the sandstone within the CO2-injection zone comprehensively. The results indicated that the strength of the sandstone was significantly reduced by H2O, scCO(2), and CO2-H2O biphasic fluids. The CO2-H2O biphasic fluid reduced the strength most significantly, followed by H2O, and finally scCO(2). Water/scCO(2) monophasic and CO2-H2O biphasic fluids significantly affected the cohesion of the sandstone, but they did not affect the internal friction angle. Compared with the strength of the H2O-injected sample, the strength of the CO2-H2O biphasic sample was reduced by -6.94%, 16.94%, and 3.28% at 10, 30, and 50 MPa, respectively. The CO2-H2O biphasic fluid significantly deteriorated the deformation modulus and stiffness and enhanced the ductility and compaction of the sandstone. A higher confining pressure could inhibit the enhanced cracking effect of scCO(2). The CO2-H2O biphasic zone within the reservoir was the most dangerous because faulting, surface subsidence, and permeability reduction of formation might occur in this zone. The results provided new information on the evolution of mechanical changes in saline aquifers injected with scCO(2) in CGS.
资助项目	National Key R&D Program of China[2018YFB0605601] ; China Postdoctoral Science Foundation[2020M671675] ; Youth Fund of the National Natural Science Foundation of China[41702289]
WOS研究方向	Engineering
语种	英语
出版者	ASCE-AMER SOC CIVIL ENGINEERS
WOS记录号	WOS:000657451200016
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27425]
专题	中科院武汉岩土力学所
通讯作者	Zhang, Qiang
作者单位	1.Powerchina Huadong Engn Corp Ltd, Hangzhou 311122, Zhejiang, Peoples R China 2.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China 3.Hohai Univ, Coll Civil Engn & Transportat, Nanjing 210098, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qiang,Ye, Wu,Chen, Yonghong,et al. Mechanical Behavior of Sandstone Pressurized with Supercritical CO2 and Water under Different Confining Pressure Conditions[J]. INTERNATIONAL JOURNAL OF GEOMECHANICS,2021,21(7):11.
APA	Zhang, Qiang,Ye, Wu,Chen, Yonghong,Li, Xiaochun,&Hu, Shaobin.(2021).Mechanical Behavior of Sandstone Pressurized with Supercritical CO2 and Water under Different Confining Pressure Conditions.INTERNATIONAL JOURNAL OF GEOMECHANICS,21(7),11.
MLA	Zhang, Qiang,et al."Mechanical Behavior of Sandstone Pressurized with Supercritical CO2 and Water under Different Confining Pressure Conditions".INTERNATIONAL JOURNAL OF GEOMECHANICS 21.7(2021):11.