Aimed at some problems of compression type open hole packer of horizontal wells such as poor sealing performance,low setting force and gap existed between rubber and well wall,a new sealing structure composed of convex spherical spacer rings and concave spherical rubbers was put forward by optimizing and improving the conventional packer sealing structure.The setting situation of sealing structure of packer spherical rubbers was simulated by ABAQUS software,the distribution regularities of contact pressure of the rubbers in axial direction were obtained,and the effects of hardness of rubber and friction coefficient on contact pressure were analyzed.The results show that the new sealing structure of convex spherical spacer ring plays a role in radial compression and axial compression of rubber at same time,so the contact pressure of rubber and well wall,rubber and central tube is improved,the sealing performance of packer is enhanced.The contact pressure of rubber and well wall is increased along with the increasing of hardness of rubber and friction coefficient.However,too big friction coefficient will lead to the decrease of contact pressure of the lower rubber,so rubber with appropriate hardness and friction coefficient must be chosen,in order to ensure the reliability of sealing packer.