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Characteristics of the Fracture Process Zone for Reservoir Rock with Various Heterogeneity

文献类型：期刊论文

作者Chen, Hongran1,2; Niu, Jingrui3; Zhai, Mengyang1,2
刊名ENERGIES
出版日期2022-11-01
卷号15期号:22页码:19
关键词Mode I crack fracture process zone heterogeneity discrete element method reservoir fracability
DOI10.3390/en15228332
英文摘要Hydraulic fracturing for oil-gas and geothermal reservoir stimulation is closely related to the propagation of Mode I crack. Nonlinear deformation due to rock heterogeneity occurs at such crack tips, which causes the fracture process zone (FPZ) to form before the crack propagates unsteadily. However, the relationship between the FPZ characteristics and rock heterogeneity still remains elusive. We used three rock types common in reservoirs for experimental investigation, and each of them includes two subtypes with different heterogeneity due to grain size or microstructural characteristics. Drawing on the experiment results, we calculated the FPZ size (represented by the radius of an assumed circular FPZ) in each cracked chevron-notched Brazilian disk, and we reproduced the formation process of the FPZ in marble using the discrete element method. We showed that strong heterogeneity is favorable to large FPZ size, can enhance the ability of crack generation and make crack morphology complex. Coupling the Weibull distribution with fracture mechanics, the dependence of the FPZ size on heterogeneity degree can be theoretically explained, which suggests that the inherent heterogeneity of rocks sets the physical foundation for formation of FPZs. These findings can improve our recognition of propagation mechanisms of Mode I cracking and provide useful guidelines for evaluating reservoir fracability.
WOS关键词MODEL ; TOUGHNESS ; FAILURE ; SIMULATION ; BEHAVIOR
资助项目National Natural Science Foundation of China[42107184] ; National Natural Science Foundation of China[41602330]
WOS研究方向Energy & Fuels
语种英语
WOS记录号WOS:000887384800001
出版者MDPI
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/107673]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Niu, Jingrui
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, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Chinese Soc Rock Mech & Engn, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Hongran,Niu, Jingrui,Zhai, Mengyang. Characteristics of the Fracture Process Zone for Reservoir Rock with Various Heterogeneity[J]. ENERGIES,2022,15(22):19.
APA Chen, Hongran,Niu, Jingrui,&Zhai, Mengyang.(2022).Characteristics of the Fracture Process Zone for Reservoir Rock with Various Heterogeneity.ENERGIES,15(22),19.
MLA Chen, Hongran,et al."Characteristics of the Fracture Process Zone for Reservoir Rock with Various Heterogeneity".ENERGIES 15.22(2022):19.

入库方式： OAI收割

来源：地质与地球物理研究所

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