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.
Highlights
The riser is the key element for drilling in ultra-deep water
Its architecture for deepwater drilling depends on numerous different factors related to operational and environmental conditions
This paper will present successively: – basic mechanics of drilling riser and a practical methodology to optimise the riser design according to API 16Q [1] recommendations; – details of Clip Riser technology; – development of lightweight hybrid steel/composite choke and kill lines; – hyperstatic integration system for auxiliary lines
Summary
Its architecture for deepwater drilling depends on numerous different factors related to operational and environmental conditions These include water depth, mud weight, auxiliary line diameters and working pressures, sea states and current profiles, and maximum rig offset. The hyperstatic auxiliary lines designed to participate in the axial strength of the riser allowing reduction, reduced fatigue stresses and decreased resonant periods in deep water are studied. All these improvements will contribute to better understand the behavior of riser and to upgrade standard-riser applications and enable them to drill in deeper water depths, in harsh environments with higher mud weight. This paper will present successively: – basic mechanics of drilling riser and a practical methodology to optimise the riser design according to API 16Q [1] recommendations; – details of Clip Riser technology; – development of lightweight hybrid steel/composite choke and kill lines; – hyperstatic integration system for auxiliary lines
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