Drill bit steering

Details Drill bit steering Drill bit steering

E - Fixed Constructions

21

B

E21B 7/06 (2006.01) E21B 34/12 (2006.01)

Patent

CA 2135282

ABSTRACT Apparatus for steering a drill bit 15 at the end of a drill string 1 within a borehole to selectively effect drilling along either a curved path or a substantially straight path comprises a first downhole motor assembly 9 coupled to the drill bit 15 and operable to rotate the drill bit to effect drilling, the assembly 9 being arranged to angularly tilt the rotational axis of the drill bit 15 relative to the axis of the section of borehole being drilled, and a second downhole motor assembly 8 coupling the first motor assembly 9 to the drill string 1 and operable to rotate the first motor assembly 9. In addition the apparatus includes a lock sub 16 which is selectively actuable to (i) effect rotation of the drill bit 15 by the first motor assembly 9 while the first motor assembly is maintained at a defined axial orientation so as to cause drilling of the borehole along a curved path in the direction of tilt of the drill bit, or (ii) effect rotation of the drill bit 15 by the first motor assembly 9 while the first motor assembly is rotated by the second motor assembly 8 so as to cause drilling of the borehole along a substantially straight path. Rotation of the drill string as a whole is not required to effect drilling in either mode.

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