B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
B63B 21/50 (2006.01) E21B 19/00 (2006.01)
Patent
CA 2306278
A swivel device for a ship (10) equipped so as to serve as i.a. a production and/or a drilling ship by exploitation of submarine wells or reservoirs, respectively, containing oil and/or gas, where the ship (10) is formed with a vertically through-going shaft (12). Within the shaft (12), a turret (16) having a substantially vertical axis is rotatably mounted in relation to the hull and is included in said swivel device. Thus, when the turret (16) is moored to the seabed, the ship (10) may turn about said vertical axis, dependent on wind and/or sea currents. The swivel device comprises a first pipe (32) substantially concentrical with the turret (16) and with a smaller external diameter than the internal diameter of the turret (16), so that, between the outside of said first pipe (32) and the inner side of the turret (16), a vertically through-going annulus is formed for accommodating of several production risers (34). Said first pipe's (32) bore constitutes a vertically through-going passage for separate passage and accommodation of a drill pipe string. Said first pipe (32) is connected to the turret (16).
Cette invention concerne un dispositif de pivot destiné à un navire (10) qui est affrété de manière à servir, entre autres, de navire d'extraction et/ou de forage lors de l'exploitation de puits ou de réservoirs sous-marins, respectivement, et qui contient du pétrole et/ou du gaz. Ce navire (10) comporte un arbre vertical (12) qui le traverse. L'arbre (12) renferme une tourelle (16) qui possède un axe globalement vertical, qui est montée rotative par rapport à la coque, et qui fait partie du dispositif de pivot. Ainsi, lorsque la tourelle (16) est amarrée au fond marin, le navire (10) peut tourner autour de l'axe vertical en fonction du vent et/ou des courants marins. Le dispositif de pivot comprend un premier tube (32) qui est globalement concentrique par rapport à la tourelle (16) et qui possède un diamètre externe plus petit que le diamètre interne de ladite tourelle (16). On obtient ainsi entre l'extérieur du premier tube (32) et l'intérieur de la tourelle (16) un anneau vertical et traversant dans lequel viennent se loger plusieurs conduites montantes de production (34). L'alésage du premier tube (32) définit un passage vertical et traversant consistant en un passage distinct dans lequel on introduit un train de tiges de forage. Ce premier tube (32) est connecté à la tourelle (16).
Hitec Asa
Ridout & Maybee Llp
LandOfFree
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