Coiled tubing orienter tool with differential lead screw drive

摘要

A technique facilitates control over the orientation of a bottom hole assembly. The bottom hole assembly comprises an orienting tool having a dual-spline drive which, in turn, comprises a first lead screw portion and a second lead screw portion having threads of a first pitch and a second pitch, respectively. A motor is connected to the dual-spline drive to impart rotational motion with respect to the first threads having the first pitch. A difference in pitch between the first pitch and the second pitch enables the rotational motion imparted by the motor to be converted to a slower, higher torque, output via the second lead screw portion. As a result, the orienting tool is able to provide a selective, high torque, low-speed adjustment to the drilling orientation of the bottom hole assembly.

主权项

1. An orienter tool for a bottom hole assembly (BHA), the orienter tool comprising:
a housing defining an interior; a dual-spline drive mounted within the interior and including: a first lead screw portion with first threads having a first pitch; a second lead screw portion with second threads having a second pitch, the second pitch being different from the first pitch; a lead screw drive nut acting against the first lead screw portion within the interior of the housing to move a drive bushing axially along the second lead screw portion to force rotation of the second lead screw portion; and an output shaft connected to the second lead screw portion; a motor connected to the dual spline drive to rotate the lead screw drive nut; and a straight spline positioned about the drive bushing and mounted to constrain rotation thereof, wherein when the lead screw drive nut is rotated, the drive bushing is moved axially to impose a rotation upon the second lead screw portion and the output shaft.