E - Fixed Constructions – 21 – B
Patent
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
Jurgens Rainer
Kruger Volker
Witte Johannes
Eastman Christensen Company
Riches Mckenzie & Herbert Llp
LandOfFree
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