Angle adjustment sub
Oriented drilling tool
Adjustable bent sub
Directional drilling sub
Method and means for controlling the course of a bore hole
ApplicationNo. 181915 filed on 04/15/1988
US Classes:175/74, Sectional guide or shaft having means to lock sections in angular relation while boring175/325.4Having removable inserts
ExaminersPrimary: Neuder, William P.
Attorney, Agent or Firm
International ClassE21B 007/08
AbstractA 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.