Simplified xmas tree using sub-sea test tree

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/035 (2006.01) E21B 34/04 (2006.01)

Patent

CA 2232014

An improved sub-sea xmas tree (10) is disclosed which consists of a wellhead connector (12), a cylindrical structural housing (14) and a tree cap (16) mounted on top of the housing (14). A dual bore sub-sea completion test tree (20) is disposed in the housing (14) and it has a main production bore (22) with series ball valves (26, 28) for controlling fluid flow in the production flow path and an annulus bore (24) with a ball valve (30) therein. The ball valves are independently and remotely actuatable by a remotely operated vehicle (ROV) override system to control communication through the xmas tree (10) and to comply with various regulatory standards. A cross-over valve (82) is provided between the main bore (22) and the annulus bore (24) to allow fluid passage for well kill operations.

Arbre de Noël (10) amélioré constitué d'un connecteur (12) de tête de puits, d'un boîtier structural cylindrique (14) et d'un chapeau (16) d'arbre monté sur la partie supérieure du boîtier (14). Une tête de colonne (20) pour essai de complétion de puits sous-marin à double alésage est placée dans le boîtier (14), l'alésage de production principal (22) étant doté d'une série de vannes (26, 28) à boisseau sphérique destinées à réguler le flux de fluide dans le passage de flux de production et l'alésage annulaire (24) étant doté d'une vanne à boisseau sphérique. Lesdites vannes à boisseau sphérique peuvent être actionnées de manière indépendante et à distance par un système prioritaire par véhicule actionné à distance pour commander la communication à travers l'arbre de Noël (10) et pour répondre à diverses régulations. Une soupape d'intercommunication (82) est placée entre l'alésage principal (22) et l'alésage annulaire (24) pour permettre le passage de fluide en vue des opérations destinées à tuer un puits.

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