With the increase of reservoir pressure,140 MPa pressure grade products can no longer fully meet the needs of ultra-deep oil and gas well exploration and development,and higher pressure grade well control equipment is urgently needed.Through the analysis of the existing API 6A standard,the design principle of 175 MPa ultra-high pressure well control equipment is improved.The key technologies of high pressure,high temperature and corrosion resistant sealing structure of major wellhead equipment are studied.A new sealing structure of wellhead equipment is proposed in this study.At the same time,the performance of the sealing structure is verified by experiments,and the results show that the sealing structure has excellent resistance to high pressure,high temperature and corrosion.
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