Steerable drilling system

Details Steerable drilling system Steerable drilling system

E - Fixed Constructions

21

B

E21B 7/06 (2006.01)

Patent

CA 2710222

A steerable drilling system comprising a bottom hole assembly (18) including an upper section (22) and a steering section (24), a swivel (26) permitting adjustment of the orientation of an axis of the steering section (24) relative to that of the upper section (22), a downhole motor operative to drive the steering section (24) for rotation relative to the upper section (22), and a plurality of actuators (34) operable to control the orientation of the axis of the steering section (24) relative to that of the upper section (22), the (actuators 34) being mounted upon one of the steering section (24) and the upper section (22) a high speed sliding contact being formed between the actuators (34) and the other of the steering section (24) and the upper section (22).

La présente invention se rapporte à un système de forage dirigeable comprenant un ensemble de fond de trou (18) comprenant une section supérieure (22) et une section de direction (24), un pivot (26) permettant l'ajustement de l'orientation d'un axe de la section de direction (24) par rapport à celui de la section supérieure (22), un moteur de fond de trou efficace pour entraîner la section de direction (24) pour rotation par rapport à la section supérieure (22), et une pluralité d'actionneurs (34) permettant de commander l'orientation de l'axe de la section de direction (24) par rapport à celui de la section supérieure (22), les actionneurs (34) étant montés sur une section parmi la section de direction (24) et la section supérieure (22), un contact de coulissement à grande vitesse étant formé entre les actionneurs (34) et l'autre section parmi la section de direction (24) et la section supérieure (22).

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