An apparatus and a method for launching plugs

E - Fixed Constructions – 21 – B

Patent

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E21B 33/05 (2006.01)

Patent

CA 2306365

The invention relates to an apparatus and a method for launching plugs used in the construction of an oil or of gas well. There is provided an apparatus for launching a plug, said apparatus comprising a canister (4) connectable to a running string, a plug (6, 16) retained in said canister, and a tube (9, 13) having a bursting disk (37, 38), the arrangement being such that, in use, an increase in fluid pressure in said tube ruptures said bursting disk allowing an increase in fluid pressure above said plug to launch said plug. The apparatus is particularly suited to launching two, three or more plugs independently. There is also provided a method of launching a plug from a canister, which method comprises the steps of blocking a tube; increasing pressure in said tube above said blockage to a predetermined pressure at which a bursting disk in said tube ruptures allowing fluid pressure to increase above said plug and launches said plug.

La présente invention concerne un procédé et un dispositif de pose de bouchons tels que ceux utilisés pour la construction des puits de pétrole ou de gaz. L'invention concerne plus particulièrement un appareil permettant de poser un bouchon. Cet appareil comporte un caisson (4) se raccordant à un train courant, un bouchon (6, 16) retenu dans le caisson considéré, et un tube (9, 13) pourvu d'un disque de rupture (37, 38). L'ensemble est agencé de façon qu'une augmentation de la pression de fluide dans le tube considéré provoque la rupture du disque de rupture considéré. Il en résulte qu'une augmentation de la pression de fluide au-dessus du bouchon considéré provoque la pose du bouchon. L'appareil convient particulièrement à la pose de deux, trois, voire plusieurs autres bouchons indépendamment les uns des autres. L'invention concerne également un procédé de pose d'un bouchon à partir d'un caisson. Ce procédé consiste à bloquer un tube, puis à faire monter la pression dans le tube au-dessus du niveau du blocage jusqu'à atteindre une pression à laquelle un disque de rupture monté dans le tube considéré provoquera la rupture du disque de rupture. Cette rupture provoquera une augmentation de la pression au-dessus du bouchon considéré et par conséquent la pose du bouchon.

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