A comparison of coupled and uncoupled dynamic analysis for the flexible riser in shallow water
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Flexible risers have been used extensively in recent years for floating and early production systems. Such risers offer the advantage of having inherent heave compliance in their catenary thereby greatly reducingthe complexity of the riser-to-rig and riser-to subsea interfaces. Another advantage with flexible risers is theirgreater reliability. Concerns about fatigue life, gas permeation and pigging of lines have been overcome by extensiveexperience with these risers in production applications. In this paper, flexible riser analysis results werecompared through coupled and uncoupled dynamic analyses methods. A time domain coupled analysis capabilityhas been developed to model the dynamic responses of an integrated floating system incorporating the interactionsbetween vessel, moorings and risers in a marine environment. For this study, SPM (Single PointMooring) system for an FSU in shallow water was considered. This optimization model was integrated with atime-domain global motion analysis to assess both stability and design constraints of the flexible riser system
Abstract
Flexible risers have been used extensively in recent years for floating and early production systems. Such risers offer the advantage of having inherent heave compliance in their catenary thereby greatly reducingthe complexity of the riser-to-rig and riser-to subsea interfaces. Another advantage with flexible risers is theirgreater reliability. Concerns about fatigue life, gas permeation and pigging of lines have been overcome by extensiveexperience with these risers in production applications. In this paper, flexible riser analysis results werecompared through coupled and uncoupled dynamic analyses methods. A time domain coupled analysis capabilityhas been developed to model the dynamic responses of an integrated floating system incorporating the interactionsbetween vessel, moorings and risers in a marine environment. For this study, SPM (Single PointMooring) system for an FSU in shallow water was considered. This optimization model was integrated with atime-domain global motion analysis to assess both stability and design constraints of the flexible riser system
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