Wells – Guide for device or conduit – On sucker or pump rod
Patent
1984-05-08
1986-06-17
Novosad, Stephen J.
Wells
Guide for device or conduit
On sucker or pump rod
33178F, E21B 1710
Patent
active
045950555
ABSTRACT:
A device for centering a tool forming a part of a tool string, inside a cased well, comprises a central bar suitable for being integrated in a tool string for lowering the tool inside the tubing, two slides which are slidable over a limited range of said central bar, and a series of wheel-carrying structures of generally triangular geometry defined by arms which are hinged to said slides. The device further comprises a series of wheels with each wheel being mounted to rotate freely on a respective one of said wheel-carrying structures in a plane which is inclined relative to a radial plane through the wheel-carrying structure in such a manner that its periphery projects radially outwardly. When the wheel-carrying structures are fully retracted against the central bar, the wheels are received in recesses provided in the outer surface of the central bar. Resilient return means are provided to urge the wheels radially outwardly.
REFERENCES:
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patent: 2267110 (1941-12-01), Kinley et al.
patent: 2497990 (1950-02-01), Hubber et al.
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patent: 2971582 (1961-02-01), Marsh
patent: 3092182 (1963-06-01), Blagg
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patent: 3915229 (1975-10-01), Nicolas
patent: 4243099 (1981-01-01), Rodger, Jr.
Bui Thuy M.
Novosad Stephen J.
Schlumberger Technology Corporation
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