Centralizer for wellbore apparatus

Details Centralizer for wellbore apparatus Centralizer for wellbore apparatus

1988-02-08

1989-05-16

Novosad, Stephen J.

Wells

Guide for device or conduit

On sucker or pump rod

33178F, E21B 1710

Patent

active

048301051

ABSTRACT:
A borehole centralizer includes an elongated shank member on which opposed head members are slidable and are connected to articulated arms which are movable radially inwardly and outwardly to centralize a tubing string or apparatus in a borehole in which the centralizer is disposed. A tension coil spring is disposed around the shank and connected to the opposed head members for exerting an axially directed force which is converted to radially directed forces urging the articulated arms radially outwardly. The centralizer is operable to exert substantially constant outward biasing forces on the articulated arms for a relatively wide range of borehole diameters.

REFERENCES:
patent: 1898074 (1933-02-01), Bailey
patent: 3092182 (1963-06-01), Blagg
patent: 3097433 (1963-07-01), Cubberly, Jr.
patent: 3555689 (1971-01-01), Cubberly, Jr.
patent: 3978924 (1976-09-01), Roesner
patent: 3997003 (1976-12-01), Adkins
patent: 4425966 (1984-01-01), Garney
patent: 4557327 (1985-12-01), Kinley et al.
patent: 4615386 (1986-10-01), Briscoe
patent: 4619322 (1986-10-01), Armell et al.

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