Based on the experimental data of friction and wear test of drill joint and casing,the joint-casing wear coefficient was calculated by using the energy loss wear theory of Dawson and White.The three dimensional (3D) finite element model of joint-casing eccentric wear was constructed by using ABAQUS.The process of casing partial eccentric wear in drilling was exactly stimulated by using redevelopment Umeshmotion user subroutine and Arbitrary Lagrange-Euler adaptive meshing techniques to adjust the location of the wear node timely,and the remaining strength of collapse and burst of casing after wear was analyzed.The result of research demonstrates that the shape of worn casing is crescent,and the maximum wear depth by numerical simulation presents non-linear relationship with the time.Moreover the remaining strength of casing presents approximate linear relationship with the increasing of the maximum wear depth.Casing wear impacts the remaining collapse strength at most.When the remaining thickness is less than 50%,the casing will lost the load capacity of collapse but it still has some burst strength.The failure behaviors of eccentric worn casing are collapse and tensile failure by internal and external pressure.