Dynamic Responses of the Cylindrical Floating Drilling Production Storage and Offloading System with Annular Anti-Motion Structures under the Survival Sea Scenario

At present, dry wellheads are usually adopted on small-storage TLP and SPAR platforms to develop offshore oil gas because of the robust hydrodynamic performance under severe-wind seas. On other hand, FPSO FDPSO that have a larger storage capacity can hardly use this cost-saving facility due their relatively poor vertical motion performance. Cylindrical FPSOs proposed improve heave ship-type FPSOs, but behaviors still too large adopt wellheads. In present work, cylindrical platform is based FWPSO platform, adding an extension cylinder new damping structure at bottom. Their performances calculated by potential theory compared in frequency domain. Taking two particular mooring systems, including both catenary ‘chain-polyester-chain’ types, survival sea scenario South China Sea into account, time-domain coupling analysis was simulate dynamic platform-mooring system. The feasibility wellhead adoption discussed investigating tension. results show FCDS with ‘chain-polyester-chain’-type system meet response requirements, also requirements specification.