Torque absorber for downhole drill motor

Details Torque absorber for downhole drill motor Torque absorber for downhole drill motor

2006-05-16

2006-05-16

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

Processes

C175S299000, C175S305000, C175S322000, C175S323000

Reexamination Certificate

active

07044240

ABSTRACT:
A torque absorber is disposed on a drill string near the motor. The torque absorber automatically adjusts the weight on a drill bit and reduces the likelihood of motor stall caused by resistance to drill bit rotation. The torque absorber includes an upper unit assembly and a lower unit assembly. The upper unit assembly includes a top sub and a ball body. The lower unit assembly includes a bottom sub, a lead screw, and a ball retainer. The components of the lower unit assembly are free to rotate as a result of motor back torque, which is in a direction opposite of the direction of rotation of the drill bit during normal drilling. The upper unit assembly will remain stationary while the components of the lower unit assembly rotate in this opposite direction. A spring applies a force on the lead screw.

REFERENCES:
patent: 3539026 (1970-11-01), Sutliff et al.
patent: 4518888 (1985-05-01), Zabcik
patent: 4901806 (1990-02-01), Forrest
patent: 315209 (2003-07-01), None

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