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  4. 中国科学院页岩气与地质工程重点实验室
Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors

文献类型：期刊论文

作者Wang, Song1,2,3,4; Zhou, Jian1; Zhang, Luqing2,3,4; Han, Zhenhua2,3; Kong, Yanlong2,3,4
刊名ROCK MECHANICS AND ROCK ENGINEERING
出版日期2023-10-17
页码32
ISSN号0723-2632
关键词Hydraulic fracturing Particle flow code Grain-based model Natural fracture Fracture propagation behavior Sensitivity analysis
DOI10.1007/s00603-023-03594-8
英文摘要Activating closed natural fractures (NFs) in hot dry rock (HDR) reservoirs is a critical way to improve fluid conductivity and stimulate production. However, the current hydraulic fracturing simulation technology is limited in its ability to investigate the interaction mechanism between hydraulic fractures (HFs) and NFs under the interference of mineral heterogeneity in HDR. In this study, we combine a modified hydro-grain-based model (hydro-GBM) and the smooth joint model (SJM) to establish a discrete element model of granite with closed NFs, investigating the effects of in-situ stress, approach angle, and physico-mechanical properties of NFs on interaction modes. Our results show that mineral heterogeneity induces HFs on both sides of the borehole to propagate asymmetrically along low-strength minerals and mineral boundaries, enhancing the complexity of HFs. As the approach angle, NF interface friction coefficient, or NF bond strengths decrease and differential in-situ stress or NF permeability increases, the offset of HFs propagating along NFs increases, thus promoting the activation degree of NFs and resulting in a decline in the average activity level of acoustic emission (AE) events and the proportion of large events in NFs. Furthermore, numerical simulations reveal the evolution laws of fracturing results, such as breakdown pressure, fracture propagation pressure, spatial distribution of microcracks, fluid pressure field, and normal stresses on NFs, which provide valuable insights for constructing complex and efficient fracture networks in HDR reservoirs. A smooth joint coupling hydro-grain-based model is proposed to describe the crystalline rock with closed natural fractures from the mineral grain scale.The model reproduces the interaction modes between hydraulic fractures and natural fractures similar to the experimental results.Effects of in-situ stress, approach angle, and physico-mechanical properties of natural fractures on interaction processes are deeply analyzed.Evolution laws of normal stresses and AE responses for natural fractures during interactions are revealed.
WOS关键词HOT DRY ROCK ; ENHANCED GEOTHERMAL SYSTEM ; BONDED-PARTICLE MODEL ; INDUCED SEISMICITY ; FLOW CODE ; GRANITE ; PERMEABILITY ; STIMULATION ; PROPAGATION ; INJECTION
资助项目This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904).[41972287] ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904).[52192623] ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904).[42277144] ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904).[42107190] ; National Natural Science Foundation of China[2019QZKK0904] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
WOS研究方向Engineering ; Geology
语种英语
出版者SPRINGER WIEN
WOS记录号WOS:001084698400001
资助机构This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 41972287, 52192623, 42277144, 42107190) and the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904). ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
源URL[http://ir.iggcas.ac.cn/handle/132A11/110712]  
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Zhou, Jian
作者单位1.Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
2.Chinese Acad Sci, Key Lab Shale Gas & Geoengn, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Song,Zhou, Jian,Zhang, Luqing,et al. Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors[J]. ROCK MECHANICS AND ROCK ENGINEERING,2023:32.
APA Wang, Song,Zhou, Jian,Zhang, Luqing,Han, Zhenhua,&Kong, Yanlong.(2023).Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors.ROCK MECHANICS AND ROCK ENGINEERING,32.
MLA Wang, Song,et al."Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors".ROCK MECHANICS AND ROCK ENGINEERING (2023):32.

入库方式： OAI收割

来源：地质与地球物理研究所

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