A wellhead assembly for communicating with the casing hanger...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/035 (2006.01) E21B 7/12 (2006.01) E21B 29/12 (2006.01) E21B 33/037 (2006.01)

Patent

CA 2468433

A subsea wellhead assembly has the capabilities of communicating from the outer surface of an outer wellhead housing (11) to a casing annulus. Seals (34) between the outer (11) and inner (27) wellhead housing define an annular chamber when the inner wellhead housing lands. The outer wellhead housing (11) has a communication port (23) formed through one of its sidewalls. The inner wellhead housing (27) has a passageway (39) extending from the annular chamber to the bore of the inner wellhead housing (27). The casing annulus located radially inward of the inner wellhead housing (27) is in communication with the outer surface of the outer wellhead housing (11) through the passageway (39), the annular chamber between the seal (34) and the communication port (23).

L'invention porte sur une tête de puits sous-marin permettant d'établir une communication entre la surface extérieure de l'enceinte extérieure de la tête de puits et l'annulaire du tubage. Des joints placés entre les enceintes extérieure et intérieure de la tête de puits délimitent une chambre annulaire là ou butte l'enceinte de la tête de puits. L'enceinte extérieure de la tête de puits présente un port de communication percé dans l'une de ses parois latérales. L'enceinte intérieure de la tête de puits présente un passage reliant la chambre annulaire à l'alésage de l'enceinte intérieure de la tête de puits. L'annulaire du tubage situé radialement à l'intérieur de l'enceinte intérieure de la tête de puits communique avec la surface extérieure de l'enceinte extérieure de la tête de puits par le susdit passage, par la susdite chambre annulaire située entre les joints, et par le susdit port de communication.

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