Extended-base tension leg platform substructure

Details Extended-base tension leg platform substructure Extended-base tension leg platform substructure

B - Operations, Transporting

63

B

B63B 35/44 (2006.01) B63B 21/50 (2006.01)

Patent

CA 2378517

An extended-base tension leg substructure (100) and method for supporting an offshore platform is disclosed which includes a plurality of support columms (102) disposed about a central axis (106) of the substructure and interconnected by at least one pontoon (110). Each columm comprises an above water and submerged portion. The substructure also includes a plurality of wings or arms (114) radiating from the columms and/or the pontoons, each wing (114) fixedly or removably securing at least one tendon extending from a wing to an anchor on the seabed. The substructure includes an open, wave transparent central zone (108) for improved access to well-related equipment, conduits or the like and the wings (114) minimize translational movement and rotational flex in the substructure reducing fatigue in the tendons and their connections (118).

L'invention concerne une sous-structure (100) de câbles tendus à base large et un procédé permettant de soutenir une plate-forme marine. Ce procédé comprend une pluralité de colonnes (102) de soutien placées autour d'un axe central (106) de la sous-structure et interconnectée par au moins un ponton (110). Chaque colonne comprend une portion en surface et une portion immergée. La sous-structure comprend également une pluralité d'ailes ou de montants (114) rayonnant depuis les colonnes et/ou les pontons. Chaque aile (114) fixe de manière fixe ou amovible au moins un tendon s'étendant depuis une aile vers un ancrage placé sur le fond de la mer. La sous-structure comprend une zone (108) centrale ouverte transparente aux vagues permettant d'améliorer le passage des équipements du puits, des canalisations ou analogues. Les ailes (14) limitent le mouvement transversal et la flexion rotative dans la sous-structure, et réduisent la fatigue des tendons et de leurs connexions (118).

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