Downhole stabilizers

Details Downhole stabilizers Downhole stabilizers

1987-06-15

1989-07-18

Massie, IV, Jerome W.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175325, 175 76, E21B 704, E21B 1710

Patent

active

048484903

ABSTRACT:
There is described a directional downhole stabilizer for use in a drill string. The stabilizer has an effective diameter which is selectively variable between a minimum diameter and a maximum diameter depending on the load on the drill string. The effective diameter is determined by radially movable spacers which are caused to move radially on relative movement of a mandrel which telescopes within the stabilizer casing and which has cam surfaces which engage the radial spacers. The telescopic movement of the mandrel within the casing is controlled via a mechanical detect arrangement which is actuated by the compressive force on the stabilizer.

REFERENCES:
patent: 3051255 (1962-08-01), Deely
patent: 3129776 (1964-04-01), Mann
patent: 4046204 (1977-09-01), Takaoka
patent: 4388974 (1983-06-01), Jones, Jr. et al.

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