Method and control system for directional drilling

Details Method and control system for directional drilling Method and control system for directional drilling

E - Fixed Constructions

21

B

E21B 7/04 (2006.01)

Patent

CA 2582365

A method and control system for directional drilling are described. A drill string motor is commanded to rotate at a constant speed in a forward direction and the constant speed in a reverse direction for a first duration and a second duration, respectively, for at least one oscillation cycle. The difference between an averaged absolute angle of the drill string and a target rotation angle for the drill string is maintained near zero by adjusting the length of the durations as necessary. The target rotation angle can be changed based on measurement while drilling data obtained during drilling operations. Advantageously, friction between the drill string and bore hole is reduced, leading to an increase in the drilling penetration rate.

L'invention concerne un procédé et un système de commande de forage directionnel. Un moteur de train de forage est commandé pour tourner à une vitesse constante dans une direction avant et dans une direction inverse sur une première durée et une seconde durée, respectivement, pour au moins un cycle d'oscillation. La différence entre l'angle absolu moyen du train de forage et l'angle de rotation cible du train de forage est maintenue près de zéro par réglage de la longueur des durées tel que nécessaire. L'angle de rotation cible peut être modifié à partir des données de forage mesurées au cours des opérations de forage. Le frottement entre le train de forage et le trou de forage est avantageusement réduit, permettant une augmentation du taux de pénétration de forage.

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