Electro-hydraulically controlled tractor

Details Electro-hydraulically controlled tractor Electro-hydraulically controlled tractor

E - Fixed Constructions

21

B

E21B 23/04 (2006.01) E21B 4/18 (2006.01) E21B 23/00 (2006.01)

Patent

CA 2321072

A tractor (20) for moving within a borehole comprises body and two propulsion assemblies (24, 26) that are longitudinally movably engaged with the body. The tractor body has annular pistons (34, 36, 38, 40) configured to receive hydraulic thrust to propel the body longitudinally. Each propulsion assembly includes a gripper (42, 52) and propulsion cylinders (44, 46, 48, 50). The gripper has an actuated position in which the gripper limits relative movement between the gripper and the inner surface of the borehole, and a retracted position in which the gripper permits free relative movement between the gripper and the inner surface of a borehole. Each propulsion cylinder contains one of the pistons. The tractor includes a control assembly (30) having valves and hydraulic circuitry which control the sequencing of fluid distribution to the propulsion cylinders, and of the actuation and retraction of the grippers. A throttle valve (54) controls the fluid flowrate to the pistons.

L'invention concerne un outil tracteur (20) pouvant se déplacer à l'intérieur d'un trou de forage et comprenant un corps et deux ensembles de propulsion (24, 26) montés sur le corps de manière à pouvoir se déplacer longitudinalement. Le corps de l'outil tracteur comporte des pistons annulaires (34, 36, 38, 40) conçus pour recevoir une propulsion hydraulique, en vue d'entraîner le corps longitudinalement. Chaque ensemble de propulsion comprend une pince (42, 52) ainsi que des cylindres de propulsion (44, 46, 48, 50). Cette pince présente une position d'actionnement dans laquelle elle limite son mouvement relatif par rapport à la surface interne du trou, ainsi qu'une position escamotée dans laquelle le mouvement relatif de la pince et de la surface interne du trou est libre. Chaque cylindre de propulsion renferme un des pistons. L'outil tracteur comprend un ensemble de commande (30) doté de valves et d'un circuit hydraulique qui commande l'enchaînement de la distribution de fluide aux cylindres de propulsion, de l'actionnement et de l'escamotage des pinces. Un robinet de réglage (54) commande la vitesse d'écoulement du fluide vers les pistons.

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