Hydraulic thruster for use in a drill string

Details Hydraulic thruster for use in a drill string Hydraulic thruster for use in a drill string

E - Fixed Constructions

21

B

E21B 44/00 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2224720

A hydraulic thruster (1) for generating a thrust force to a drill bit located at the lower end of a drill string is provided. The thruster comprises a first member (3) connectable to an upper part of the drill string and a second member (5) connectable to a lower part of the drill string, said members being telescopingly arranged relative to each other and being capable of transmitting torque between the upper and lower part of the drill string during drilling. A fluid passage (9) for passing through said members (3, 5) for drilling fluid flowing through the drill string towards the drill bit and means (11, 15) for generating an inward telescoping reaction of said members upon transmission of torque between the upper and lower part of the drill string during drilling are provided.

Cette invention concerne un propulseur hydraulique (1) qui permet d'engendrer une force de poussée sur le foret situé à l'extrémité inférieure d'un train de sonde. Ledit propulseur comporte un premier élément (3) que l'on peut connecter à une partie supérieure du train de sonde et un second élément (5) que l'on peut connecter à une partie inférieure du train de sonde, lesdits éléments étant disposés de façon télescopique l'un par rapport à l'autre et pouvant transmettre le couple de torsion entre les parties supérieure et inférieure du train de sonde au cours du forage. L'invention concerne également un passage pour fluide (9) qui traverse lesdits éléments (3,5) et qui permet à un fluide de forage de s'écouler à travers le train de sonde en direction du foret, ainsi que des organes (11, 15) qui engendrent entre lesdits éléments une réaction télescopique dirigée vers l'intérieur lorsque le couple de torsion est transmis de la partie supérieure à la partie inférieure du train de sonde au cours du forage.

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