Abstract:Due to working in an environment of high temperature and high pressure and complex stratum,the packer rubber of open well staged fracturing of low permeability reservoir are usually appeared with low setting force and earlier failure of setting,and leakage between rubber and center pipe,which result in packer sealing failure.A new sealing structure was proposed which consisted of cross spacer ring and groove rubbers.The stress distribution of the packer was analyzed by ABAQUS,including rubbers contact stress along the well wall and center pipe,rubbers Mises stress along the borehole wall.The effects of material hardness and packer sealing force on the contact stress of sealing structure were investigated.The results show that the new sealing structure of packer realizes the full contact of the rubbers with the borehole wall and center pipe.The contact stress of rubber is increased significantly and its distribution is more even,which ensures the sealing reliability of the packer.The rubbers Mises stress along the borehole wall is reduced,which avoids the rubber torn.The contact stress between the rubbers and the borehole wall is increased with the material hardness and packer sealing force.