Downhole disconnect tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/00 (2006.01) E21B 17/06 (2006.01) E21B 23/04 (2006.01)

Patent

CA 2199192

A hydraulic disconnect is disclosed which allows flow therethrough for normal downhole operations. A shiftable sleeve is provided which closes off internal flow passages to permit pressure build-up which is in turn used to move a piston to undermine a dog to facilitate release. Shifting of a sleeve is accomplished by either creating backpressure through flow or by differential pressure between the inside of the joint and the annulus which is used to shift a piston which in turn acts on the release sleeve which in turn blocks a passage so that subsequent pressure build-up can result in shifting of another piston to undermine dogs which allows the joint to separate. The tool transmits torque through its body without stressing the locking dogs. Tensile and compressive loads are handled through the body giving the tool the connection strength of a tool joint.

La présente invention porte sur un raccord rapide de type hydraulique servant à régler un débit durant les opérations courantes de fond de trou. Un manchon mobile obture les passages intérieurs pour permettre l'établissement de la pression, ce qui entraînera par la suite le déplacement du piston pour débloquer le taquet de sécurité et faciliter l'évacuation du produit. Le mouvement d'un manchon est commandé soit en créant un refoulement de pression, soit un différentiel de pression entre l'intérieur du joint et l'anneau utilisé pour décaler un piston qui agit à son tour sur le manchon d'évacuation qui obturera un passage de manière que l'accumulation de pression subséquente déplace un autre piston pour débloquer les taquets de sécurité empêchant l'ouverture du joint. Le corps de l'outil dont il est question transmet un couple de force sans exercer de tension sur les taquets de sécurité. Les charges de traction et de compression sont véhiculées par le corps même de l'outil, ce qui donne à ce dernier la même résistance qu'un raccord de tiges.

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