Single bore riser system

Details Single bore riser system Single bore riser system

E - Fixed Constructions

21

B

E21B 17/01 (2006.01) E21B 33/035 (2006.01) E21B 34/04 (2006.01)

Patent

CA 2232034

A single bore riser (12) system is disclosed which is based on a dual bore completion tree (16). An eccentric offset sub (14) is coupled to the top of the tree (16) and which can be sealed by BOP pipe rams. The completion tree (16) has a main bore (18) and an auxiliary bore (20) with ball valves (22, 24) located in the respective bores. A remotely actuatable annulus plug (28) is located in the bottom of the annulus bore (2) and is moveable between a first position allowing fluid flow through the annulus bore (2) and a second position sealing the annulus bore (2) to provide control of various operations. Embodiments of the invention are described.

L'invention décrit un système de colonne montante (12) à un seul alésage, reposant sur une tête d'extraction pour la complétion (16) à double alésage. Un raccord excentré (14) est relié au sommet de la tête (16) et peut être fermé par des mâchoires d'obturateur. La tête de complétion (16) comprend un alésage principal (18) et un alésage auxiliaire (20) avec des valves à boulets (22, 24) situées dans les alésages respectifs. Un bouchon annulaire (28) commandable à distance est placé au fond de l'alésage annulaire (2) et peut être passé d'une première position qui permet l'écoulement de fluide par l'alésage annulaire (2) à une seconde position qui ferme l'alésage annulaire (2) pour pouvoir commander différentes opérations. Des modes de réalisation de l'invention sont décrits.

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