Patent ID: 9493987
Filing Date: 2016-11-15
CPC Classification: E21B,Y10T

Claim Text:
1. A method for orienting a bottom hole assembly (BHA), the method comprising: mounting a dual-spline drive within the interior of an elongated housing of an orienter tool, the dual-spline drive including a first lead screw portion with first threads of a first pitch and a second lead screw portion with second threads of a second pitch, the second pitch being different from the first pitch; axially fixing a lead screw drive nut held about the first lead screw portion for engagement with the first threads, wherein the lead screw drive nut may be rotated within the interior of the housing; mounting a drive bushing for movement axially along the second lead screw portion while engaged with the second threads; connecting the second lead screw portion to an output shaft; constraining rotation of the drive bushing; and rotating the lead screw drive nut to force axial movement of a movable member of the first lead screw portion against the drive bushing so as to force rotation of the second lead screw portion, thus imposing a rotation upon the output shaft.