Experimental study of hydraulic fracture propagation with multi-cluster in-plane perforations in a horizontal well  

作　　者：Xian Shi Yuan-Yuan Yang Xiang-Wei Kong Qi Gao Shu Jiang Hai-Jun Mao 

机构地区：[1]College of Petroleum Engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,PR China [2]State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,266580,Shandong,PR China [3]School of Petroleum Engineering,Yangtze University,Wuhan,430100,Hubei,PR China [4]Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan,430100,Hubei,PR China [5]School of Engineering,The University of Western Australia,Perth,WA,6009,Australia [6]Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,School of Earth Resources,China University of Geosciences,Wuhan,430074,Hubei,PR China [7]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,Hubei,PR China

出　　处：《Petroleum Science》2024年第5期3258-3270,共13页石油科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (51704324, 52374027);Natural Science Foundation of Shandong Province (ZR2023ME158, ZR2022ME025);Open Fund of Key Laboratory of Tectonics and Petroleum Resources (TPR-2020-14)。

摘　　要：Tri-axial fracturing studies were carried out to understand the impact of lateral mechanical parameters on fracture propagation from multiple in-plane perforations in horizontal wells. Additionally, the discussion covered the effects of geology, treatment, and perforation characteristics on the non-planar propagation behavior. According to experimental findings, two parallel transverse fractures can be successfully initiated from in-plane perforation clusters in the horizontal well because of the in-plane perforation, the guide nonuniform fishbone structure fracture propagation still can be exhibited. The emergence of transverse fractures and axial fractures combined as complex fractures under low horizontal principal stress difference and large pump rate conditions. The injection pressure was also investigated, and the largest breakdown pressure can be also found for samples under these conditions.The increase in perforation number or decrease in the cluster spacing could provide more chances to increase the complexity of the target stimulated zone, thus affecting the pressure fluctuation. In a contrast, the increase in fracturing fluid viscosity can reduce the multiple fracture complexity. The fracture propagation is significantly affected by the change in the rock mechanical properties. The fracture geometry in the high brittle zone seems to be complicated and tends to induce fracture reorientation from the weak-brittle zone. The stress shadow effect can be used to explain the fracture attraction, branch, connection, and repulsion in the multiple perforation clusters for the horizontal well.The increase in the rock heterogeneity can enhance the stress shadow effect, resulting in more complex fracture geometry. In addition, the variable density perforation and temporary plugging fracturing were also conducted, demonstrating higher likelihood for non-uniform multiple fracture propagation. Thus, to increase the perforation efficiency along the horizontal well, it is necessary to consider the lateral fracability o

关 键 词：Heterogeneous rock In-plane perforation Stress shadowing Tri-axial fracturing Multiple perforation clusters 

分 类 号：TE243[石油与天然气工程—油气井工程]