Method of and apparatus for directional drilling

E - Fixed Constructions – 21 – B

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E21B 44/04 (2006.01) E21B 7/06 (2006.01) E21B 44/00 (2006.01)

Patent

CA 2509347

A method of and system for directional drilling reduces the friction between the drill string and the well bore. A downhole drilling motor is connected to the surface by a drill string. The drilling motor is oriented at a selected tool face angle. The drill string is rotated at said surface location in a first direction until a first torque magnitude without changing the tool face angle. The drill string is then rotated in the opposite direction until a second torque magnitude is reached, again without changing the tool face angle. The drill string is rocked back and forth between the first and second torque magnitudes.

La présente invention a trait à un procédé et un système pour le forage dirigé réduisant la friction entre le train de tiges et le puits de forage. Un moteur de forage de fond de puits est relié à la surface par un train de tiges. Le moteur de forage est orienté à un angle choisi de la face de coupe. Le train de tiges est entraîné en rotation au dit emplacement de surface en une première direction jusqu'à une première grandeur de couple sans modification de l'angle de la face de coupe. Le train de tiges est ensuite entraîné en rotation dans la direction opposée jusqu'à l'obtention d'une deuxième grandeur de couple, également sans modification de l'angle de la face de coupe. Le train de tiges est basculé en un mouvement de va-et-vient entre les première et deuxième grandeurs de couple.

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