Abstract:When the fracturing packer is seated successfully,there is still a small annular leakage gap between the rubber tube and the borehole wall or casing wall surface.The crude oil,natural gas and drilling fluid will leak through the gap under a sufficiently large pressure difference,which will lead to the seal failure of the packer.In order to study the nature of seal failure of packer rubber from a dynamic point of view,the fluid penetration model of packer was established.The exact parameters of rubber hyperelastic constitutive model were obtained by fitting the uniaxial tensile test data of rubber samples at high temperature with Mooney-Rivlin constitutive model.The process of fluid penetrating the packer was simulated by using the invasive boundary method.The simulation results show that the reason for the failure of the packer rubber is that the fluid with excessive pressure penetrates the contact surface between the rubber and the well wall(or casing wall),forming a leak path.The critical hydraulic pressure of leakage is 7770 MPa when the first seal cylinder fails,while measured critical hydraulic pressure of leakage by the high temperature and high pressure test well is 8239 MPa.The error between 〖JP3〗test and simulation result is less than 10%,which proves that the simulated process of fluid penetrating the packer is accurate.