In recent years, offshore reservoirs have been developed in deeper and deeper water environments. SCRs (Steel catenary risers) are being considered in deepwater development such as Northern North Sea. SCRs used in conjunction with a semi-submersible or FPSO (floating production, storage and offloading) in deepwater harsh environments present significant design challenges. The large vertical motions at the semi or FPSO induce severe riser response, which results in difficulty meeting strength and fatigue criteria at the hang off and touch down point locations. To improve the understanding of SCR behaviour and increase the confidence in the design of such systems in deepwater harsh environments, a parametric study on a SCR connected to a semi-submersible was carried out in this paper to deal with the factors that mainly influence the loading condition and fatigue life of the riser. Weight-optimized configurations were applied during the course of riser design. Riflex combined with DeepC was the primary analysis tool used for the long-term response of the nonlinear SCR structure simulations, which requires a large amount of computer time. Hence, the parameters affecting the efficiency and accuracy of the simulations have also been studied during the analysis process.


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    Title :

    A parametric design study for a semi/SCR system in Northern North Sea


    Additional title:

    Eine parametrische Entwurfsstudie für ein Halbtaucher/Hängebrücken-Steigrohr-System in der nödlichen Nordsee


    Contributors:

    Published in:

    Ocean Engineering ; 35 , 17-18 ; 1686-1699


    Publication date :

    2008


    Size :

    14 Seiten, 16 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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