The results demonstrate the effectiveness of fully-coupled analysis of the FPSO and DAS system for warning limits determination. Further, the correlative influence factors, consisting of the wave, wind and current conditions, different flexible jumper lengths, FPSO offsets as well as artificial seabed locations, are systematically investigated. The effectiveness of the method is verified in the case study of the coupled FPSO-DAS system. On this basis, a drift-off analysis method is proposed in the determination of drift-off warning limits of FPSO. The fully-coupled dynamic model of the FPSO and DAS coupling system is established.
This study is committed to establishing criteria of drift-off warning limits for dynamically positioned FPSO and DAS coupling system. Nonetheless, FPSO may drift off due to dynamic positioning (DP) system failures and ocean environment loads, and thus loses the capability to maintain position, which poses significant threats to the structural integrity of the DAS system. The new Deepwater Artificial Seabed (DAS) system is developed for dynamically positioned Floating Production, Storage and Offloading (FPSO) vessel, with a focus on important issues of well access and riser design.
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