Ported subsea wellhead

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/14 (2006.01) E21B 33/035 (2006.01) E21B 33/043 (2006.01)

Patent

CA 2472225

A susbsea well has communication passages (39,41) to enable annulus pressure surrounding inner (31) and intermediate (25) strings of casings to be monitored at the surface. The passages (39,41) both have outlets that allow communication to the tree assembly (55) for monitoring. In one embodiment, the passage outlets are located in the bore of the high pressure well head housing (15) and communicates to the tree assembly (55) along an isolation sleeve (61). In another embodiment, the passage outlets (145,153) are located on the exterior of the high pressure wellhead housing and communicate through a flying lead (161) coming down from the tree. In another embodiment, the passage outlets are located on the exterior of the high pressure wellhead housing and communicate to an upward facing connection (291) which is stabbed with a downward facing connection (293) coming down from the tree.

La présente invention concerne un puits sous-marin pourvu de passages de communication destinés à permettre de surveiller, depuis la surface, la pression de l'espace annulaire autour des tiges intérieures et intermédiaires des cuvelages. Les deux passages comportent des orifices de sortie qui permettent la communication en direction de l'ensemble arbre de Noël. Selon un mode de réalisation, les orifices de sortie des passages sont situés dans l'alésage du carter de tête de puits haute pression, en communication avec l'ensemble arbre de Noël dans la longueur d'un manchon isolant. Selon un autre mode de réalisation, les orifices de sortie des passages sont situés sur l'extérieur du carter de tête de puits haute pression, en communication par une manche volante descendant de l'arbre de Noël. Selon encore un autre mode de réalisation, les orifices de sortie des passages sont situés sur l'extérieur du carter de tête de puits haute pression, en communication vers un raccord tourné vers le haut, pourvu d'un vissage tourné vers le bas venant de l'arbre de Noël.

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