Numerical Simulation of Uniform Propagation of Multiple Fracture Promotion though Non-uniform Perforation and Temporary Plugging

doi:10.11885/j.issn.1674-5086.2023.05.10.01

Abstract

Abstract: Multi-cluster fracturing of horizontal wells is a key technique for unconventional oil and gas development, in which uneven propagation of multiple fractures is a critical factor limiting production increases. Based on a planar three-dimensional model of multi-fracture propagation, taking into account the heterogeneity of in-situ stress, non-uniform perforation, and temporary plugging within the fracturing stage, a multi-cluster fracturing model for horizontal wells was established and a program was developed to simulate the dynamic propagation of unevenly expanding fractures with consideration of in-situ stress heterogeneity. The study found that the heterogeneity of in-situ stress within the fracturing stage had a significant impact on the competitive expansion of multiple fractures. Adding 2～4 perforation holes in high-stress clusters could balance stress heterogeneity to a certain degree, but there is an efficiency limit when the in-situ stress heterogeneity is strong. Regarding the temporary plugging process within the fracturing stage, the timing of temporary plugging had almost no effect on the increase in bottom hole pressure, and early temporary plugging was beneficial for the balanced distribution of liquid between clusters. The number of temporary plugging operations had a significant impact on the increase in bottomhole pressure, and three temporary plugging operations could increase bottom hole pressure by about 10 MPa. Two to three temporary plugging operations could achieve a relatively balanced liquid injection, but the effect of promoting balanced injection becomes less clear when the number of temporary plugging operations exceeds two.

Key words: fracture propagation, multi-cluster fracturing, non-uniform perforation, temporary plugging, liquid injection distribution

CLC Number:

TE377

HE Yunbin, REN Jichuan, CHEN Ming, GUO Tiankui, WANG Yunpeng. Numerical Simulation of Uniform Propagation of Multiple Fracture Promotion though Non-uniform Perforation and Temporary Plugging[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(5): 99-111.

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