Cyclic Experimental Studies on Damage Evolution Behaviors of Shale Dependent on Structural Orientations and Confining Pressures

doi:10.3390/en11010160

	Cyclic Experimental Studies on Damage Evolution Behaviors of Shale Dependent on Structural Orientations and Confining Pressures
	Cheng, Cheng 1,2,3; Li, Xiao 1,2,3
刊名	ENERGIES
	2018
卷号	11 期号:1
关键词	shale damage process strain energy dissipation orientation of weak planes confining pressure anisotropic behavior
ISSN号	1996-1073
DOI	10.3390/en11010160
文献子类	Article
英文摘要	Damage process of shale is of great importance when considering the wellbore stability and reservoir stimulation during the work of shale gas recovery. As shale has typical transversely isotropic structures and may be under different stress states in the reservoir, the damage process should be studied while considering both loading directions and confining pressures. A series of cyclic uniaxial and tri-axial compressive tests have been carried out on the shale samples with different oriented weak planes and confining pressures. The dissipated strain energy and its ratio to the releasable elastic strain energy have been studied comparing with the fracturing patterns of the samples. Based on the strain energy dissipation, damage variable is defined and the damage evolution equation is built to describe the damage process of shale samples dependent on loading directions and confining pressures. The damage equation shows that the damage of the shale samples increases as a power function of the axial stress. Under higher confining pressures, the damage is limited in the early loading stage, while it increases significantly with the formation of macro shear fractures when the peak strength is approaching. The change of increasing rate is weak for the shale samples ( = 60 degrees) as the main failure pattern is slip along the weak planes. This study is helpful for understanding the damage process and failure of wellbore, as well as the stimulation effect of the shale gas reservoir.
WOS关键词	TOMOGRAPHY CT EXPERIMENTS ; TRIAXIAL COMPRESSION ; ENERGY-DISSIPATION ; UNLOADING PATHS ; FAILURE PROCESS ; STRENGTH ; ROCK ; COAL ; FRACTURE ; PERMEABILITY
WOS研究方向	Energy & Fuels
语种	英语
出版者	MDPI AG
WOS记录号	WOS:000424397600160
资助机构	Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; XDB10030301) ; XDB10030301) ; XDB10030301) ; XDB10030301) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; XDB10030301) ; XDB10030301) ; XDB10030301) ; XDB10030301) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; XDB10030301) ; XDB10030301) ; XDB10030301) ; XDB10030301) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB10050201 ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; National Natural Science Foundation of China(41402286) ; XDB10030301) ; XDB10030301) ; XDB10030301) ; XDB10030301)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82868]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, Xiao
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cheng, Cheng,Li, Xiao. Cyclic Experimental Studies on Damage Evolution Behaviors of Shale Dependent on Structural Orientations and Confining Pressures[J]. ENERGIES,2018,11(1).
APA	Cheng, Cheng,&Li, Xiao.(2018).Cyclic Experimental Studies on Damage Evolution Behaviors of Shale Dependent on Structural Orientations and Confining Pressures.ENERGIES,11(1).
MLA	Cheng, Cheng,et al."Cyclic Experimental Studies on Damage Evolution Behaviors of Shale Dependent on Structural Orientations and Confining Pressures".ENERGIES 11.1(2018).