Drilling and completion system for multilateral wells

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/10 (2006.01) E21B 41/00 (2006.01) E21B 43/30 (2006.01)

Patent

CA 2381286

A wellbore system is provided comprising a main wellbore extending into an earth formation, a branch wellbore extending from a selected location of the main wellbore into the earth formation and a casing arranged in the main wellbore. A branching device is arranged in the casing and connected to a conduit extending through the casing to a wellbore facility at surface, the branching device having a main bore in fluid communication with the wellbore facility via the conduit, and a branch bore providing fluid communication between the main bore and the branch wellbore via a window opening provided in the casing. A seal is provided between said body and the inner surface of the casing so as to prevent fluid communication between the window opening and the interior of the casing.

L'invention concerne un système de forage comprenant un puits de forage principal s'étendant dans une formation terrestre, une ramification du puits de forage s'étendant d'un emplacement sélectionné du puits de forage principal dans la formation terrestre, et un tubage placé dans le puits de forage principal. Un dispositif ramifié placé dans le tubage est connecté à un conduit s'étendant dans le tubage jusqu'à une installation de surface du puits de forage, ledit dispositif ramifié comprenant un trou de forage principal en communication fluidique avec l'installation du puits de forage par l'intermédiaire du conduit, et une ramification du trou de forage permettant d'établir une communication fluidique entre le trou de forage principal et la ramification du trou de forage, par l'intermédiaire d'une ouverture à fenêtre située dans le tubage. Une fermeture hermétique est située entre le corps et la surface intérieure du tubage de manière à prévenir toute communication fluidique entre l'ouverture à fenêtre et l'intérieur du tubage.

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