Downhole drilling of a lateral hole

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/18 (2006.01) E21B 7/06 (2006.01) E21B 17/03 (2006.01) E21B 27/00 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2553236

A system for drilling a lateral hole departing from a main well. The system comprises a motor assembly (415) including a motor (412) to generate a rotating torque, an axial thruster (411) to generate an axial force, a blocking system (410) to fix the motor and the axial thruster downhole. The motor assembly further includes a drive shaft (414) to transmit the rotating torque. The system further comprises a first and second connector (402, 404) for transmitting the rotating torque and the axial force from the motor assembly to a drill string assembly. The first connector is connectable to the drill string assembly so as to transmit the axial force only to the drill pipe (401), and to transmit the rotating torque to a further drive (405) shaft positioned within the drill pipe. The second connector (402) is connectable to the drill string assembly so as to transmit both the axial force and the rotating torque to the drill pipe (401).

L'invention concerne un système permettant de forer un trou latéral partant d'un puits principal. Ce système comporte un ensemble moteur (415) comprenant un moteur (412) destiné à produire un couple de rotation, un propulseur axial (411) destiné à produire une force axiale, et un système de blocage (410) destiné à fixer au fond le moteur et le propulseur axial. L'ensemble moteur possède également un arbre de transmission (414) destiné à transmettre le couple de rotation. Ledit système comporte également un premier et un deuxième connecteur (402, 404) permettant de transmettre le couple de rotation et la force axiale depuis l'ensemble moteur jusqu'à un ensemble garniture de forage. Le premier connecteur se raccorde à l'ensemble garniture de forage de manière à transmettre la force axiale uniquement à la tige de forage (401), et à transmettre le couple de rotation à un autre arbre de transmission (405) placé à l'intérieur de la tige de forage. Le deuxième connecteur (402) se raccorde à l'ensemble garniture de forage de manière à transmettre à la fois la force axiale et le couple de rotation à la tige de forage (401).

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