Mechanically opened ball seat and expandable ball seat

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/10 (2006.01) E21B 23/08 (2006.01) E21B 34/06 (2006.01)

Patent

CA 2554066

A method and apparatus for obstructing the passage of fluid within a fluid flow conduit and subsequently reconfiguring the tool to allow substantially full- bore passage therethrough. Pressure developed upstream of the obstruction can be utilized to operate pressure actuated tools such as liner hangers. Equipment used in subsequent wellbore operations such as drill pipe darts can pass undamaged through the opened port. In an embodiment, the flow through a tubular is obstructed by placing a ball on an expandable ball seat, developing a pressure differential across the ball seat, equalizing the pressure after the hydraulically actuated tool completes its function, and mechanically manipulating the drill string to open the expandable ball seat and allow the ball to pass through.

La présente concerne une méthode et un appareil pour obstruer le passage de fluide dans un conduit d'écoulement de fluide et ensuite reconfigurer l'outil pour permettre le passage essentiellement libre dans le tube. La pression développée en amont de l'obstruction peut servir à faire fonctionner des outils actionnés par pression, comme des suspensions de colonne perdue. L'équipement utilisé dans les opérations subséquentes de forage comme les fléchettes de tube de forage peuvent passer sans dommage dans le port ouvert. Dans un mode de réalisation, le flux à travers un tube est obstrué en plaçant une rotule sur un siège à rotule expansible, ce qui crée une différence de pression de part et d'autre du siège de rotule, égalise la pression après que l'outil à commande hydraulique achève sa fonction, et permet de manipuler mécaniquement le train de tiges pour ouvrir le siège de rotule expansible et permettre le passage de la rotule.

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