Method of and system for directional drilling

Details Method of and system for directional drilling Method of and system for directional drilling

E - Fixed Constructions

21

B

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

Patent

CA 2525382

A method of and system for directional drilling reduces the friction between the drill string (35) and the well bore (33). A downhole drilling motor (41) is connected to a drilling rig (11) at the surface by a drill string (35). The drilling motor (41) is oriented at a selected tool face angle. The drill string (35) is rotated at the surface in a first direction until a first torque magnitude is reached without changing the tool face angle. The drill string (35) 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 rotated back and forth between the first and second torque magnitudes. Pressure inside the drill string is measured, and the first and second torque magnitudes are adjusted in response to changes in the pressure.

La présente invention concerne un procédé et un système de forage dévié réduisant le frottement du train de tiges sur les parois du puits. Un moteur de forage de fond de trou est relié par un train de tiges à une installation de forage en surface. Depuis la surface, on fait tourner le train de tiges dans un premier sens jusqu'à une première grandeur de couple ne modifiant pas l'angle de coupe de l'outil. On fait tourner ensuite le train de tiges en sens inverse jusqu'à une deuxième grandeur de couple, ne modifiant pas non plus l'angle de coupe de l'outil. On fait tourner le train de tiges en va-et-vient entre les deux grandeurs de couple. On mesure la pression à l'intérieur du train de tiges, et on corrige les deux grandeurs de couple en réaction aux modifications de la pression.

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