Variable diameter drill rod stabilizer

Details Variable diameter drill rod stabilizer Variable diameter drill rod stabilizer

1981-04-13

1983-06-21

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

175 76, E21B 708

Patent

active

043889743

ABSTRACT:
A variable diameter drill rod stabilizer including an inner piston having cam surfaces which bear against wall engaging segments. Movement of the piston axially within a drill rod section by differential pressure of a fluid flowing through a passage in the piston moves the wall engaging segments radially and controls the diameter of the stabilizer.

REFERENCES:
patent: 1323391 (1919-12-01), Hillman
patent: 2319236 (1943-05-01), Isaacus et al.
patent: 2643859 (1953-06-01), Brown
patent: 3098534 (1963-07-01), Carr et al.
patent: 3301337 (1967-01-01), Vaughn et al.
patent: 4270619 (1981-06-01), Base

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