Release mechanism for downhole tool

Details Release mechanism for downhole tool Release mechanism for downhole tool

E - Fixed Constructions

21

B

E21B 17/06 (2006.01)

Patent

CA 2602305

A release mechanism for a downhole tool is actuated by radial movement of a locking member. The locking member (64) provided as much as full circumferential support in the locked position and once released can be prevented from re-gripping the previously connected elements. Illustrative examples of the mechanism for radial movement for release comprise sleeves that expand and radially oriented pistons (78). Shear pins or collets are not used to hold the components together in the preferred embodiment. Internal pressure fluctuations before initiating the release sequence will not cause unwanted release. The mechanism is applicable to a variety of downhole tools and is illustrated in the context of a hydraulic release.

L~invention concerne un outil de débrayage pour un outil de fond, actionné par mouvement radial d~un élément de verrouillage. L~élément de verrouillage (64) offre un support circonférentiel complet dans la position verrouillée et ne risque pas, une fois débrayé, de venir une nouvelle fois en prise avec les composants préalablement assemblés. Des modes de réalisation du mécanisme de débrayage à mouvement radial comprennent des manchons qui se dilatent et des pistons (78) à orientation radiale. Le mode de réalisation préféré n~utilise pas de goupilles de cisaillement ou de douilles de serrage pour solidariser les composants. L~invention permet d~éviter tout débrayage intempestif dû à des variations de pression interne préalablement au déclenchement de l~opération de débrayage. Le mécanisme de l~invention trouve une application dans de nombreux outils de fond et est illustré dans le contexte d~un débrayage hydraulique.

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