Near bit offset stabilizer

摘要

A near bit offset stabilizer for use with a bent sub or bent motor housing is presented wherein a mechanism is provided to correctly orient and lock the stabilizer in a desired position in alignment with the bend angle in the bent sub or bent motor housing. This alignment and locking mechanism comprises a ring nut having a series of radial slots on its lower end; and the provision of a series of corresponding radial slots on the upper end of the stabilizer. The corresponding slots permit mutual interlocking between the ring nut and stabilizer for locking the stabilizer in any one of a plurality of radial positions. A scribe line or other indicia on the stabilizer permits visual alignment with the bend in the bent sub or bent motor housing in the drill string above. Finally, a second nut locks the stabilizer in the selected radial position. An important feature of the present invention is that the offset stabilizer may be easily radially adjusted and locked in a given orientation with the desired orientation typically being in alignment with the bend in a bent sub or bent motor housing to enhance directional drilling. Another feature of the present invention is that the slotted ring nut may be easily removed permitting the utilization of a conventional stabilizer (concentric or offset) or permitting the deletion of a stabilizer altogether.