Downhole tool

Details Downhole tool Downhole tool

E - Fixed Constructions

21

B

E21B 10/32 (2006.01) E21B 23/04 (2006.01)

Patent

CA 2674030

The invention relates to a bottom tool comprising a tubular body (1) with an axial chamber, a hollow piston (8) capable of sliding in said axial chamber, and an actuation device including a trigger member (14) connected to the hollow piston and capable of displacement from a hollow-piston immobilisation position to a withdrawal position in which it releases the hollow piston, a detent tubular sleeve (16) of the trigger member connected to the hollow piston by at least one shearing pin (17), and means for temporarily blocking the detent tubular sleeve that generates a hydraulic pressure rise on the tubular sleeve with a shearing of said at least one shearing pin and the sliding of the detent tubular sleeve in a release position in which the trigger member is capable of displacement into its withdrawal position.

Outil de fond comportant un corps tubulaire (1 ) doté d'une cavité axiale, un piston creux (8) capable de coulisser dans ladite cavité axiale et un dispositif d'activation comprenant un élément de gâchette (14) solidaire du piston creux qui est déplaçable depuis une position d'immobilisation du piston creux vers une position d'effacement dans laquelle il libère le piston creux, un manchon tubulaire de détente (16) de l'élément de gâchette relié au piston creux par au moins une goupille de cisaillement (17), et un moyen d'obturation temporaire du manchon tubulaire de détente qui provoque une élévation de pression hydraulique sur le manchon tubulaire avec un cisaillement de ladite au moins une goupille de cisaillement et un coulissement du manchon tubulaire de détente dans une position de libération permettant un déplacement de l'élément de âchette dans sa osition d'effacement.

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