Activating device for a downhole tool

Details Activating device for a downhole tool Activating device for a downhole tool

E - Fixed Constructions

21

B

E21B 23/04 (2006.01) E21B 10/26 (2006.01)

Patent

CA 2661518

An activating device (2) is intended to be mounted in a drill string in order to control the activation and deactivation of an enlargement tool used for enlarging a bore hole. In order to assemble the activating device, pistons 8 are mounted in passages (10) and spline bars (12) in which plates (22) are screwed are then slid along T-slots of the body (1), through apertures (18) of the pistons. In order to deploy the pistons (12) and cutters (6), pressurised drilling fluid is applied to the inner faces (8a) of the pistons (8). When a pre-determined pressure level is reached, screws (20) break and the pistons move from the inward position to the outwardly deployed position.

Un dispositif d'activation (2) est conçu pour être monté dans un train de tiges de forage pour commander l'activation et la désactivation d'un instrument d'agrandissement utilisé pour un trou de forage, Pour assembler le dispositif d'activation, on monte des pistons (8) dans des passages (10) et des barres cannelées (12) dans lesquelles les plaques (22) vissées sont ensuite glissées le long des fentes en T du corps (1), par les ouvertures (18) des pistons. Pour déployer les pistons (12) et les coupe-tiges (6), un fluide de forage sous pression est appliqué aux côtés intérieurs (8a) des pistons (8). Lorsqu'un niveau de pression pré-déterminé est atteint, les vis (20) se rompent et les pistons passent de la position intérieure vers la position déployée extérieure.

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