The present invention relates to hybrid riser towers, and in particular hybrid riser towers for a drill centre. A riser is provided comprising a plurality of conduits extending in use from the seabed toward the surface and having an upper end adapted to be supported in use at a depth below the sea surface wherein said riser is provided with buoyancy along at least a part of its length, wherein said buoyancy is in the form of blocks located at intervals along the length of the riser, wherein said blocks are arranged symmetrically around a central structural core to form a substantially circular cross-section, and wherein said blocks are arranged non-contiguously around said central structural core. 220a 220b -- - ~ 410 L i Fig. 4b


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    Title :

    Hybrid riser tower



    Publication date :

    2015-08-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / E21B EARTH OR ROCK DRILLING , Erd- oder Gesteinsbohren



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