Directional drilling system and apparatus

Details Directional drilling system and apparatus Directional drilling system and apparatus

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 47/022 (2006.01)

Patent

CA 2334334

The apparatus, in one embodiment, has guide housing (113) with a shaft (101) extending through the guide housing (113) with a drill bit (105) coupled to its forward end (101F). The shaft (101) may be moved to a forward drilling position or to a rearward shifting position relative to the guide housing (113). A cam is located inside of the guide housing. A cam follower (131) is coupled to the shaft. In the shifting mode, the cam follower (131) is disengaged from the cam. A clutch (261) is provided for coupling the cam to the shaft when the shaft is in the shifting position such that the cam follower may be rotated with the shaft relative to the cam to allow the cam follower to engage the cam when the shaft is moved to the forward drilling position. In the forward drilling position of the shaft, the clutch releases the cam from the shaft and the cam follower engages the cam to allow straight drilling to occur or to cause the axis of said guide housing to shift relative to the axis of the shaft to cause the direction of drilling by the shaft and drill bit to change.

L'invention porte sur un appareil qui dans une exécution comporte un tube de guidage (113) traversée par un arbre (101) couplé à un trépan (105) monté à son extrémité inférieure (101F). L'arbre (101) peut passer par rapport au tube de guidage (113) d'une position avant de forage à une position arrière de déplacement angulaire. Le tube est muni d'une came, tandis qu'une contre-came (131) est solidaire de l'arbre. En position de déplacement angulaire, la contre-came ne touche pas la came. Un embrayage (261) relie la came à l'arbre en position de déplacement angulaire, ce qui permet à la contre-came d'entrer en contact avec la came quand l'arbre passe en position de forage droit. Dans cette position, l'embrayage sépare la came de l'arbre et la contre-came entre en contact avec la came, soit pour permettre le forage droit, soit pour amener l'axe du tube de guidage à pivoter par rapport à l'axe de l'arbre et à entraîner un changement de la direction de forage de l'arbre et du trépan.

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