The influences of perforating phase and bedding planes on the fracture deflection in laminated shale  

作　　者：Ming-Zhe Gu Mao Sheng Xiao-Ying Zhuang Xin-Yi Li Gen-Sheng Li 

机构地区：[1]National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing,102249,China [2]College of Petroleum Engineering,China University of Petroleum,Beijing,102249,China [3]College of Civil Engineering,Tongji University,Shanghai,200092,China

出　　处：《Petroleum Science》2024年第2期1221-1230,共10页石油科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.52074315&U19B6003)。

摘　　要：The perforating phase leads to complex and diverse hydraulic fracture propagation behaviors in laminated shale formations. In this paper, a 2D high-speed imaging scheme which can capture the interaction between perforating phase and natural shale bedding planes was proposed. The phase field method was used to simulate the same conditions as in the experiment for verification and hydraulic fracture propagation mechanism under the competition of perforating phase and bedding planes was discussed.The results indicate that the bedding planes appear to be no influence on fracture propagation while the perforating phase is perpendicular to the bedding planes, and the fracture propagates along the perforating phase without deflection. When the perforating phase algins with the bedding planes, the fracture initiation pressure reserves the lowest value, and no deflection occurs during fracture propagation. When the perforating phase is the angle 45°, 60°and 75°of bedding planes, the bedding planes begin to play a key role on the fracture deflection. The maximum deflection degree is reached at the perforating phase of75°. Numerical simulation provides evidence that the existence of shale bedding planes is not exactly equivalent to anisotropy for fracture propagation and the difference of mechanical properties between different shale layers is the fundamental reason for fracture deflection. The findings help to understand the intrinsic characteristics of shale and provide a theoretical basis for the optimization design of field perforation parameters.

关 键 词：SHALE Propagation PERFORATING BEDDING Structure 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]