Swivel

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/038 (2006.01) E21B 34/04 (2006.01) E21B 43/013 (2006.01)

Patent

CA 2261650

Swivel assembly for installation at a well for subsea production of oil or gas, and adapted to be connected to a production vessel at the sea surface, comprising a main or fluid swivel having at least two paths (21, 22) and an electric/hydraulic auxiliary swivel (28) for signal communication and power transfer. The fluid swivel is provided with a rotatable swivel housing (24) at the top of a stationary Christmas tree (50), preferably comprising a small number of valves, such as a production master valve (51) and an annulus master valve (52). Said paths (21, 22) are through-running vertically in the central core member (25) of the fluid swivel so as to make possible well intervention from the upper side of the fluid swivel.

Cette invention concerne un système de tête d'injection qui est installé dans un puits d'extraction sous-marine de pétrole ou de gaz, et qui est relié à un vaisseau de production se trouvant en surface. Ce système comprend une tête d'injection de fluide, ou tête d'injection principale, qui comporte au moins deux voies (21, 22), ainsi qu'une tête d'injection auxiliaire électrique/hydraulique (28) qui assure la transmission de signaux et le transfert de forces. La tête d'injection de fluide comprend une enceinte rotative (24) qui est située au sommet d'un arbre de Noël stationnaire (50). Ce dernier comprend de préférence un nombre de vannes réduit comme, par exemple, une vanne maîtresse de production (51) et une vanne maîtresse annulaire (52). Les voies (21, 22) traversent verticalement l'élément noyau central (25) de la tête d'injection de fluide, ceci de manière à ce que l'on puisse effectuer une intervention dans le puits depuis le côté supérieur de ladite tête d'injection.

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