Simulation investigation on spatial deflection of multiples fractures of multistage perforation clusters in hydraulic fracturing

• Published in: Méitàn kēxué jìshù Vol. 51; no. 9; pp. 160 - 169
• Main Authors: Yongliang WANG, Nana LIU, Hao WANG
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Coal Science and Technology 01.09.2023
• Subjects: disturbance deflection of multiple fractures; finite element-discrete element model; stress shadow effect; thermal-hydro-mechanical coupling; three-dimensional fracturing fracture
• ISSN: 0253-2336
• DOI: 10.12438/cst.2022-1358

The morphology of complex fracture network in hydraulic fracturing engineering in deep tight oil and gas reservoir is a crucial factor affecting oil and gas recovery, and it is necessary to accurately evaluate and optimize the fracture propagation behavior. Multistage fracturing of horizontal wells with multiple perforation clusters involves thermal diffusion, fluid flow and deformation of rock matrix between the reservoir and fluid in pores and fractures. Thermal diffusion effect and multi-physical field coupling are typical characteristics of fracturing in deep tight rock reservoirs. At the same time, the propagation of fracture network is related to the disturbance between adjacent fractures. The perforation clusters spacing and initiation sequence in fracturing process will lead to different degrees of unstable propagation of parallel fractures. It is of great significance to understand the influence mechanisms of internal and external factors for the effective evaluation of fracture networks, such as the