Abstract:The superdeep well and heavy oil well has higher requirement in temperature tolerance of the seals,and fracturing well,injecting well, layering well has higher requirement in pressure tolerance of the seals.While the longterm effectiveness for seals is faced severe challenges by the proposed ideas of unmovable pipe column of water injecting well.The structure and performance characteristics of several new styles of downhole of gas and oil reservoirs were introduced,which included unitized sealing of Freudenberg,Tsealing of IS sealing,metal Oring of Trelleborg,metal to metal combined packer of Freudenberg,super elastical memory alloy packer and so on.Among which the styles of integral sealing,Tsealing and metal Oring can satisfy the need of small sealing gap of the downhole of gas and oil reserviors under working condition of high temperature and high pressure.The metal to metal combined packer and super elastical memorial alloy packer provide a solution for large sealing gap in heavy oil well under very bad enviornment of high temperature and high H2S content.