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Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking
Zeng XG; Wei YJ(魏宇杰); Wei, YJ (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Source PublicationJOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
2017-04-01
Volume101Pages:235-249
ISSN0022-5096
Abstract

Driven by the rapid progress in exploiting unconventional energy resources such as shale gas there is growing interest in hydraulic fracture of brittle yet heterogeneous shales. In particular how hydraulic cracks interact with natural weak zones in sedimentary rocks to form permeable cracking networks is of significance in engineering practice. Such a process is typically influenced by crack deflection material anisotropy crack-surface friction crustal stresses and so on. In this work we extend the He-Hutchinson theory (He and Hutchinson 1989) to give the closed-form formulae of the strain energy release rate of a hydraulic crack with arbitrary angles with respect to the crustal stress. The critical conditions in which the hydraulic crack deflects into weak interfaces and exhibits a dependence on crack-surface friction and crustal stress anisotropy are given in explicit formulae. We reveal analytically that with increasing pressure hydraulic fracture in shales may sequentially undergo friction locking mode II fracture and mixed mode fracture. Mode II fracture dominates the hydraulic fracturing process and the impinging angle between the hydraulic crack and the weak interface is the determining factor that accounts for crack deflection; the lower friction coefficient between cracked planes and the greater crustal stress difference favor hydraulic fracturing. In addition to shale fracking the analytical solution of crack deflection could be used in failure analysis of other brittle media. (C) 2017 Elsevier Ltd. All rights reserved.

KeywordBrittle Materials Shale Hydraulic Fracturing Crack Deflection Strain Energy Release Rate Heterogeneous Interfaces
DOI10.1016/j.jmps.2016.12.012
Indexed BySCI ; EI
Language英语
WOS IDWOS:000398751200016
WOS KeywordHYDRAULIC-FRACTURE PROPAGATION ; STRESS INTENSITY FACTORS ; ENERGY-RELEASE RATE ; 2 ORTHOTROPIC MEDIA ; NETWORK PROPAGATION ; NATURAL FRACTURES ; DISCONTINUITIES ; INITIATION ; CRITERION ; TOUGHNESS
WOS Research AreaMaterials Science ; Mechanics ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Mechanics ; Physics, Condensed Matter
Funding OrganizationNational Natural Science Foundation of China (NSFC)(11425211)
DepartmentLNM微结构计算力学
Classification一类/力学重要期刊
Ranking1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60558
Collection非线性力学国家重点实验室
Corresponding AuthorWei, YJ (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Zeng XG,Wei YJ,Wei, YJ . Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2017,101:235-249.
APA Zeng XG,Wei YJ,&Wei, YJ .(2017).Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,101,235-249.
MLA Zeng XG,et al."Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 101(2017):235-249.
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