Method and apparatus for controlling azimuthal drift of a...

Details Method and apparatus for controlling azimuthal drift of a... Method and apparatus for controlling azimuthal drift of a...

E - Fixed Constructions

21

B

255/6

E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 7/10 (2006.01) E21B 17/16 (2006.01)

Patent

CA 1217472

METHOD AND APPARATUS FOR CONTROLLING AZIMUTHAL DRIFT OF A DRILL BIT ABSTRACT A method of and apparatus for controlling the azimuthal drift of a drill bit in an inclined well bore is described. The method comprises prestressing a drill collar member in torsion to adjust the angle in the horizontal plant that the drill bit makes with the longitudinal axis of the well bore when the drill collar is subjected to the gravitational, axial, and torsional forces of the drilling operation. The drill collar includes an inner tubular member and an outer tubular member. The two are held against relative rotation at one end. The desired torque is placed in the members by rotating the other ends of the members relative to each other in the desired direction. A splined member engages grooves in the inner and outer surfaces of the members to hold the members in their prestressed state.

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