Abstract: The riser of an offshore platform is an important structure connecting the offshore operation platform and the submarine pipeline. The environment in which it is located is relatively harsh and the safety hazard is great. However,the riser structure of a large number of old platforms in the Bohai Sea is in an unprotected state. This paper investigates and statistically analyzes the current situation of the riser structure of oil and gas submarine pipelines and mixed pipelines in the Bohai Sea. On this basis,the research on the scheme design of the new anti-collision structure engineering is carried out. The design of the anti-collision structure fully considers the various arrangements and types of platform risers and the convenience of maintenance and replacement of the risers in the later stage. The COLLPASE module of SACS software is used for ship collision analysis,which can provide reference for the design of the anti-collision structure of offshore platform risers.

Key words: offshore platform, riser, anti-collision structure, construction scheme