Stochastic bit noise control

E - Fixed Constructions – 21 – B

Patent

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E21B 7/06 (2006.01)

Patent

CA 2694977

A drill bit direction system and method is disclosed that modifies or biases the stochastic movement of the drill bit and/or stochastic interactions between the drill bit and an inner- wall of a borehole being drilled by a drilling system to change the direction of drilling of the drilling system. The direction of the drill bit is monitored to determine if the direction happens to align in some way with a preferred direction. If the direction isn't close enough to a preferred direction, a biasing mechanism modifies the stochastic movement in an attempt to modify the direction closer to the preferred direction. Any of a number of biasing mechanisms can be used. Some embodiments can resort to conventional steering mechanisms to supplement the biasing mechanism.

L'invention porte sur un système et sur un procédé de direction d'un trépan, lesquels modifient ou orientent le mouvement stochastique du trépan et/ou les interactions stochastiques entre le trépan et une paroi interne d'un puits de forage en cours de forage par un système de forage pour changer la direction de forage du système de forage. La direction du trépan est surveillée pour déterminer si la direction vient à s'aligner d'une certaine manière dans une direction préférée. Si la direction n'est pas assez proche de la direction préférée, un mécanisme d'orientation modifie le mouvement stochastique pour essayer de rapprocher la direction de la direction préférée. L'un quelconque d'un certain nombre de mécanismes d'orientation peut être utilisé. Certains modes de réalisation peuvent avoir recours à des mécanismes de direction classiques pour compléter le mécanisme d'orientation.

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