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Supercritical CO2 fracturing with different drilling depths in shale

文献类型：期刊论文

作者Yang, Hongwei9; Zhao Y(赵源)6,7,8; Zhang, Xinghua5; Liu, Guojun4; Du, Xidong3; Shang, Delei2; Yu, Yongjun8; Chen, Juan1; Wang, Hui7; Tu, Huaijian8
刊名ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
出版日期2021-02-02
页码20
关键词Acoustic emission fracturing supercritical CO2 damage characteristic crack morphology
ISSN号1556-7036
DOI10.1080/15567036.2019.1673850
通讯作者Zhao, Yuan(zhao.yuan@cqu.edu.cn)
英文摘要Shale gas is a crucial unconventional natural gas; carbon dioxide is a serious greenhouse gas. Therefore, using supercritical carbon dioxide as a fracturing fluid can fracture shale reservoirs and exploit shale gas as well as store carbon dioxide to slow the greenhouse effect. In this study, supercritical carbon dioxide fracturing experiments were conducted at different drilling depths. They showed that structural failure pressure decreased with the increase in borehole and sealing lengths owing to the larger excavation damage zone induced by borehole drilling. During the fracturing process, acoustic emission signals were recorded, which exhibited similar development tendencies, and this process could be divided into four parts based on the acoustic emission characteristic. The saltation of fluid pressure was due to the saltation of isothermal compression and expansion occurring in phase change processes. Moreover, crack morphology before and after the fracturing were scanned and rebuilt by computed tomography instruments, which displayed that an effective fracturing crack could be generated by supercritical carbon dioxide. Although the cark morphology was relatively simple, a complex crack could be formed at a deep drilling depth as revealed by the comparisons of the box dimension, crack perimeter, and crack area at different drilling depths. Based on the acoustic emission accumulation counts, a damage variable was introduced to describe failure degree. Furthermore, based on a previous work and the damage characteristic and fluid pressure features, the entire process of supercritical carbon dioxide fracturing could be divided into five main stages. In addition, the chemical reaction between the shale matrix and the fracturing fluid was analyzed. The supercritical fracturing fluid could dissolve and remove substances, improving the shale porosity and connectivity.
分类号Q3
资助项目National Natural Science Foundation of China[51474039] ; National Natural Science Foundation of China[51404046] ; National Natural Science Foundation of China[51904043] ; National Natural Science Foundation of China[U1361205] ; Natural Science Foundation of Hunan Province[2019JJ50150] ; China Postdoctoral Science Foundation[2018M641366] ; Scientific Research Foundation of State Key Laboratory of Coal Mine Disaster Dynamics and Control[2011DA105287-ZD201302] ; Scientific Research Foundation of State Key Laboratory of Coal Mine Disaster Dynamics and Control[2011DA105287-MS201403]
WOS研究方向Energy & Fuels ; Engineering ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000614513100001
资助机构National Natural Science Foundation of China ; Natural Science Foundation of Hunan Province ; China Postdoctoral Science Foundation ; Scientific Research Foundation of State Key Laboratory of Coal Mine Disaster Dynamics and Control
其他责任者Zhao, Yuan
源URL[http://dspace.imech.ac.cn/handle/311007/86028]  
专题力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位1.Hunan Univ Sci & Technol, Natl Local Joint Engn Lab Marine Mineral Resource, Xiangtan, Peoples R China
2.Tsinghua Univ, Dept Civil Engn, Beijing, Peoples R China;
3.East China Univ Technol, Sch Earth Sci, Nanchang, Jiangxi, Peoples R China;
4.Xiangtan Univ, Coll Environm & Resources, Xiangtan, Peoples R China;
5.Taiyuan Univ Technol, Sch Safety Technol & Equipment, Taiyuan, Peoples R China;
6.Chinese Acad Sci, Inst Mech, Beijing, Peoples R China;
7.Chongqing Univ, Coll Resource & Environm Sci, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing, Peoples R China;
8.POWERCHINA, Sinohydro Bur 8 Co LTD, Changsha 410004, Peoples R China;
9.CCTEG Shen Yang Res Inst, State Key Lab Coal Mine Safety Technol, Fushun, Peoples R China;
推荐引用方式
GB/T 7714		 Yang, Hongwei,Zhao Y,Zhang, Xinghua,et al. Supercritical CO2 fracturing with different drilling depths in shale[J]. ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS,2021:20.
APA Yang, Hongwei.,赵源.,Zhang, Xinghua.,Liu, Guojun.,Du, Xidong.,...&Tu, Huaijian.(2021).Supercritical CO2 fracturing with different drilling depths in shale.ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS,20.
MLA Yang, Hongwei,et al."Supercritical CO2 fracturing with different drilling depths in shale".ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS (2021):20.

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来源：力学研究所

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