Tool for optional straight hole drilling in underground rock...

Details Tool for optional straight hole drilling in underground rock... Tool for optional straight hole drilling in underground rock...

E - Fixed Constructions

21

B

255/6

E21B 7/08 (2006.01) E21B 7/06 (2006.01)

Patent

CA 1317929

ABSTRACT OF THE INVENTION An apparatus adapted to drill either a straight or arcuate borehole is disclosed. The apparatus includes a bottomtime assembly which is adapted to be rotated along with the drill string for drilling a generally straight borehole. The bottomtime assembly includes a downhole motor which is adapted to be actuated to drill a generally arcuate borehole. The method and apparatus of the present invention are particularlly adapted to accomplish these ends with minimal lateral offset of the bottom of the drill bit relative to the drill string, while still including an optimal angle of deflection of the bit.

589965

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