Low Cost Deepwater Hybrid Riser System

Low Cost Deepwater Hybrid Riser System
May 1997
S. Hatton

The design and analysis of a cost effective multi flowpath Deep water developments to date have largely extended shallow production riser for deep and ultra deep water floating produc- water, flexible riser, technology through the development and tion systems is presented. The design is based on a bundled application of new materials and manufacturing techniques. concept using beach fabrication and installation by near surface However, extending a successful shallow water solution to deep tow. The study has been funded by the DeepStar project and water is not necessarily the most economic or technically addresses water depths between 1300 and 2200m in the Gulf of preferable approach. Whilst in shallow water high pipe flexibilMexico. The riser is designed to interface with a semi submers- ity is required to accommodate vessel motions, in deep water ible production vessel but may also be used with an FPSO with stiffer pipe may be considered due to the beneficial effect of minor modifications.

The design approach minimises the riser steel weight and In recent years new riser arrangements have been conceived to buoyancy requirements and achieves an optimum dynamic meet the challenge of deep water, offering significant commerresponse through an efficient structural design and buoyancy cial and technical advantages over conventional riser systems. distribution. This maximises riser flexibility and minimises These new riser systems utilize steel pipe which has a relatively hydrodynamic wave loading.

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