Research on Dynamic Slip of Fault Resulted from Multistage Fracturing of Shale Gas Reservoir
In the Luzhou shale gas block,severe casing deformation occurs during development,and multi-stage fracturing is the main factor inducing fault slip and causing casing deformation.However,there is currently a lack of research on the evolution of dynamic slip of fault.In this paper,based on the analysis of casing deformation and failure characteristics and correlation in Luzhou area,considering the communication and activation of faults by hydraulic fractures,a numerical model for the dynamic evolution of fault slip under multistage fracturing conditions was built.The results show that multistage fracturing leads to an increase in near-wellbore pore pressure with fractu-ring stages,resulting in a decrease in effective in-situ stress.The longer the simulation time and the larger the flow rate at injection point,the greater the fault slip is,while the fracturing fluid viscosity has weak impact on fault slip.The fault length and the angle between the fault and the wellbore are closely related to the slip:the larger the fault length,the greater the fault slip;the larger the angle between the fault and the wellbore within a certain range,the smaller the fault slip.The greater the horizontal in-situ stress difference of the formation,the more ob-vious the fault slip.The research findings provide reference for controlling the operation parameters in the multi-stage fracturing process of shale gas reservoirs.
NETL
NSTL
万方数据
维普
