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Visualization of hydraulic fracture interacting with pre-existing fracture

摘要:Hydraulic fracturing is considered the main stimulation method to develop shale gas reservoirs. Due to its strong heterogeneity, the shale gas formation is typically embedded with geological discontinuities such as bedding planes and natural fractures. Many researchers realized that the interaction between natural fractures and hydraulic fractures plays a crucial role in generating a complex fracture network. In this paper, true tri-axial hydraulic fracturing tests were performed on polymethyl methacrylate (PMMA), on which pre-existing fracture was pre-manufactured to simulate natural fracture. A cohesive model has been developed to verify the results of the experimental tests. The key findings demonstrate that the experimental results agreed well with the numerical simulation outcomes where three main interaction modes were observed: crossing; being arrested by opening the pre-existing fracture; being arrested without dilating the pre-existing fracture. Crossing behavior is more likely to occur with the approaching angle, horizontal stress difference, and injection rate increase. Furthermore, the higher flow rate might assist in reactivating the natural fractures where both sides of the pre-existing fractures were reactivated as the injection rate increased from 5 to 20 mL/min. Additionally, hydraulic fractures show a tendency to extend vertically rather than along the direction of maximum horizontal stress when they are first terminated at the interface. This research may contribute to the field application of hydraulic fracturing in shale gas formation.(c) 2023 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).

关键字:Hydraulic fracturing; Natural fracture; Fracture propagation; Interaction mode; PMMA

ISSN号:1672-5107

卷、期、页:卷20期6: 3723-3735

发表日期:2023-12-01

影响因子:0.000000

期刊分区(SCI为中科院分区):二区

收录情况:SCI(科学引文索引印刷版),CSCD(中国科技引文期刊)(核心),EI(工程索引),SCIE(科学引文索引网络版)

发表期刊名称:PETROLEUM SCIENCE

通讯作者:谢紫霄,龙腾达,邹文超,孙照伟

第一作者:武晓光,黄中伟,李根生

论文类型:期刊论文

论文概要:谢紫霄,武晓光,龙腾达,黄中伟,李根生,邹文超,孙照伟,Visualization of hydraulic fracture interacting with pre-existing fracture,PETROLEUM SCIENCE,2023,卷20期6: 3723-3735

论文题目:Visualization of hydraulic fracture interacting with pre-existing fracture

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