Ultra Deep Water Drilling Riser Design and Relative Technology

Abstract : IFP has developed tools and technology to answer the waiting of contractors that wish to drill in deeper water depths, in harsher environment with higher mud weight. The methodology aims to optimise the riser design by proposing practical guidelines implemented by a software. To reduce unproductive time on the rig during the drilling, the Clip Riser has been developed. The main feature of the Clip Riser is the coupling which allows quick make-up of the riser. The clip technology is a unique design which does not require bolts, threads or any preloading in operation. To reduce drillship deckload and required tensioning capacity, the hybrid tubes have been developed to replace the existing 4 1/2 ID (114. 3 mm) steel kill and choke lines by lighter tubes. The hybrid tubes are 50% lighter than equivalent all steel lines. Advantages of this technology will be presented in this paper. To improve axial behavior of the riser and riser architecture, hyperstatic integration of choke and kill lines have been studied. This consists in fixing the auxiliary lines at each riser joint so that they can participate to the axial resistance of the riser. Advantages of this system will be presented in this paper. Finally, the technological developments should answer the waiting of contractors and will further expand the range of application of standard riser systems and make them well suited for ultra deep drilling in very harsh operational and oceanographic environments.
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J. Guesnon, C. Gaillard, F. Richard. Ultra Deep Water Drilling Riser Design and Relative Technology. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2002, 57 (1), pp.39-57. ⟨10.2516/ogst:2002003⟩. ⟨hal-02043917⟩

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