Directional drilling apparatus and method

Details Directional drilling apparatus and method Directional drilling apparatus and method

E - Fixed Constructions

21

B

255/6

E21B 7/04 (2006.01) E21B 4/20 (2006.01) E21B 7/06 (2006.01)

Patent

CA 2002135

A directional drilling apparatus and method in which the drill bit is coupled to the lower end of a drill string through a universal joint which allows the bit to pivot relative to the string axis. The bit is contra-nutated in an orbit of fixed radius and at a rate equal to string rotation but in the opposite direction. This speed-controlled and phase-controlled bit nutation keeps the bit heading off-axis in a fixed direction. The invention enables directional drilling while the drill string rotates normally.

Dispositif et méthode de forage dirigé dans lesquels l'outil de forage est relié à l'extrémité inférieure d'un train de tiges par un cardan qui permet à l'outil de pivoter par rapport à l'axe du train de tiges. L'outil de forage subit une contre-nutation dans une orbite de rayon fixe et, à une vitesse égale à la vitesse de rotation du train de tiges, mais en sens opposé à ce dernier. La nutation de l'outil de forage dont la vitesse et la phase sont contrôlées permet de conserver l'avance hors axe de l'outil de forage dans une direction fixe. L'invention permet le forage dirigé pendant que le train de tiges tourne normalement.

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