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An Evaluation Index of Fracability for Reservoir Rocks Based on Fracture Process Zone

文献类型：期刊论文

作者Chen, Hongran1,2; Niu, Jingrui3; Zhai, Mengyang1,2
刊名MATERIALS
出版日期2022-12-01
卷号15期号:23页码:18
关键词fracability fracture process zone crack tolerance chevron notched disk discrete element method
DOI10.3390/ma15238485
英文摘要A reliable evaluation method for the fracability (i.e., ability to generate abundant cracks) of reservoir rocks is a critical issue for maximum hydraulic fracturing efficiency. Most previous fracability indices lacked enough rationality and practicability, and thus could not consistently provide a reliable evaluation. We suggest a new fracability index called crack tolerance, which is represented by the maximum radius of the fracture process zone at the crack tip of a cracked chevron notched Brazilian disk specimen, which corresponds to the critical state for unstable propagation of the notched crack. In experiments and simulations based on the discrete element method, we showed quantitative methods to conveniently determine the value of the crack tolerance and showed that specimens with a greater crack tolerance generated more cracks before rupture and had complex morphologies, which would indicate stronger fracability. The crack tolerance can well characterize the effects of structural and loading conditions, including the grain size heterogeneity, bedding orientation, and environmental temperature, on fracability, and the inherent heterogeneity of rock is the physical basis for it as a fracability evaluation index. Our studies showed the rationality and practicability of this index and provide hints for how to produce abundant complex cracks in reservoirs.
WOS关键词BRITTLENESS INDEXES ; PROPAGATION ; MODEL ; TOUGHNESS ; SHALE ; ANISOTROPY
资助项目National Natural Science Foundation of China ; [42107184] ; [41602330]
WOS研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种英语
WOS记录号WOS:000896199300001
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/132A11/106983]  
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. An Evaluation Index of Fracability for Reservoir Rocks Based on Fracture Process Zone[J]. MATERIALS,2022,15(23):18.
APA Chen, Hongran,Niu, Jingrui,&Zhai, Mengyang.(2022).An Evaluation Index of Fracability for Reservoir Rocks Based on Fracture Process Zone.MATERIALS,15(23),18.
MLA Chen, Hongran,et al."An Evaluation Index of Fracability for Reservoir Rocks Based on Fracture Process Zone".MATERIALS 15.23(2022):18.

入库方式： OAI收割

来源：地质与地球物理研究所

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