A hydraulic device to be connected in a pipe string

Details A hydraulic device to be connected in a pipe string A hydraulic device to be connected in a pipe string

E - Fixed Constructions

21

B

E21B 7/24 (2006.01) E21B 4/14 (2006.01) E21B 28/00 (2006.01)

Patent

CA 2257308

The frictional resistance encountered when pushing a pipe string, specifically coiled tubing, into a well bore, is reduced by connecting to the pipe string a device adapted to generate high frequency longitudinal oscillations. The device is in the form of a double acting hydraulic cylinder (1) having automatically shiftable changeover valves (18, 20) through which a fluid such as a well effluent or drilling mud flows via the changeover valves when the pipe string is run into the well bore. The device is also suitable for alternative use as a percussion or setting tool in the pipe string.

On réduit la résistance au frottement rencontrée lorsque l'on pousse une colonne de tubes, spécifiquement un tube de production spiralé, dans un puits, en reliant à la colonne de tubes un dispositif adapté pour générer des oscillations longitudinales à haute fréquence. Le dispositif se présente sous la forme d'un vérin hydraulique à double action (1) présentant des soupapes de commutation (18, 20) à commande automatique par lesquelles un fluide tel qu'un effluent ou une boue de forage de puits s'écoule par l'intermédiaire des vannes à commutation lorsque l'on fait passer la colonne de tubes dans le puits. Le dispositif est également adapté à d'autres utilisations telles que sous la forme d'un outil à percussion ou d'un outil de mise en place dans la colonne de tubes.

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