As an important downhole fracturing tool,the sealing structure of all-metal soluble bridge plugs is a key factor affecting the fracturing efficiency.In order to explore the effect of different sealing ring structures on sealing characteristics,the numerical models of four types of metal sealing ring structures,namely single groove,elliptical,double groove and hyperbolic structures,were established,and their radial deformation characteristics and sealing performance were analyzed by using the finite element method.The effect of surface roughness of hyperbolic structure on sealing contact area,contact stress,and near-field stress distribution at the contact surface was investigated.The results show that with the increase of axial displacement of the cone,the radial deformation of four types of seal rings is always positively correlated with the cone axial displacement,and the maximum and minimum radial deformation of seal rings are located in the outer circle side with larger thickness and the outer circle side with smaller thickness respectively.The complex contact surface can enhance the sealing performance of seal rings,and under the same cone axial displacement,the hyperbolic shaped seal ring exhibits the best sealing performance,while elliptical shaped seal ring has the worst sealing performance.When considering the tangential friction,the larger the friction coefficient,the more significant the contact surface near-field Mises stress is shifted along the friction direction.The conclusions obtained provide a reference for the structural selection of downhole all-metal soluble bridge plug sealing rings.