Controlling backflow pressure during retrieval of bottom...

E - Fixed Constructions – 21 – B

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E21B 23/08 (2006.01) E21B 19/02 (2006.01) E21B 23/14 (2006.01)

Patent

CA 2725059

A bottom hole assembly in a casing-while-dr tiling operation is retrieved by displacing the fluid in the casing string with a less dense fluid than the fluid in the annulus. The bottom hole assembly moves upward in the casing string in response to an upward force due to the different densities of fluid in the casing string and in the annulus. Displaced fluid flows out of the casing string and through a restrictive orifice of a choke. The flow area of the orifice is varied as the bottom hole assembly moves upward to control the rate at which the bottom hole assembly moves upward.

La présente invention concerne un ensemble de fond de puits utilisé dans le cadre d'une opération de tubage au cours d'un forage. Selon l'invention, ledit ensemble est récupéré par déplacement du fluide dans la colonne de tubage avec un fluide moins dense que le fluide dans l'espace annulaire. L'ensemble de fond de puits se déplace vers le haut dans la colonne de tubage en réponse à une force ascendante résultant des différentes densités de fluide dans la colonne de tubage et dans l'espace annulaire. Le fluide déplacé s'écoule hors de la colonne de tubage et à travers un orifice de restriction d'une duse. La section d'écoulement de l'orifice est régulée lorsque l'ensemble de fond de puits se déplace vers le haut, ce qui permet de commander la vitesse à laquelle cet ensemble de fond de puits se déplace vers le haut.

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