Helical drilling apparatus, systems, and methods

E - Fixed Constructions – 21 – B

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E21B 17/22 (2006.01) E21B 3/02 (2006.01) E21B 7/02 (2006.01)

Patent

CA 2755628

A down-the-hole assembly includes a housing having a central axis and a mechanical gear box positioned within the housing. The mechanical gear box is coupled to the housing such that rotation of the housing at a first rotational rate provides a rotary input to the mechanical gear box. A rotary cutting bit is coupled to the mechanical gear box. The mechanical gear box is configured to rotate said rotary cutting bit at a second rotational rate in response to that rotary input from the housing. The second rotational rate is greater than the first rotational rate. The mechanical gear box is also further configured to cause the rotary cutting bit to orbit about the central axis of the housing.

Selon l'invention, un ensemble fond de trou comprend un boîtier ayant un axe central et une boîte à engrenages mécanique positionnée dans le boîtier. La boîte à engrenages mécanique est couplée au boîtier de telle sorte qu'une rotation du boîtier à une première vitesse de rotation fournit une entrée rotative à la boîte à engrenage mécanique. Un trépan tranchant rotatif est couplé à la boîte à engrenages mécanique. La boîte à engrenages mécanique est configurée pour faire tourner ledit trépan tranchant rotatif à une seconde vitesse de rotation en réponse à cette entrée rotative à partir du boîtier. La seconde vitesse de rotation est supérieure à la première vitesse de rotation. La boîte à engrenages mécanique est également en outre configurée pour amener le trépan tranchant rotatif à tourner en orbite autour de l'axe central du boîtier.

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