Method of making a centering device and centering device...

Details Method of making a centering device and centering device... Method of making a centering device and centering device...

2006-02-14

2006-02-14

Tsay, Frank S. (Department: 3672)

Wells

Guide for device or conduit

Surrounding existing device or tubing

C166S241700, C175S325500, C175S325600, C029S896600

Reexamination Certificate

active

06997254

ABSTRACT:
A spring centralizer device for supporting a tubular member spaced from the wall of a bore is made from a single piece of boron steel material. The spring centralizer device has first and second collars spaced apart along a longitudinal axis. Spring bow portions extend between the collars. As the device is made from a single piece of material, the material extends seamlessly from each collar portion through the bow portions so that there are no joins or points of weakness. Use of boron steel means that the device can be made by cold forming.

REFERENCES:
patent: 1475344 (1923-11-01), Judson
patent: 3312285 (1967-04-01), Solum
patent: 3379258 (1968-04-01), Turbyfill
patent: 3578084 (1971-05-01), Bombardieri et al.
patent: 4575912 (1986-03-01), Grip et al.
patent: 5536145 (1996-07-01), Vandendriessche
patent: 5899052 (1999-05-01), Turner
patent: 6102118 (2000-08-01), Moore
patent: 6571452 (2003-06-01), Wang
patent: WO 99/25949 (1999-05-01), None

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