Recirculating bearing antifriction system for well strings

Details Recirculating bearing antifriction system for well strings Recirculating bearing antifriction system for well strings

1980-11-17

1983-02-08

Footland, Lenard A.

Cutlery

308 6C, 175325, F16C 2906

Patent

active

043726224

ABSTRACT:
A system for minimizing frictional stress and wear between elements of a well string and a surrounding casing or other conduit containing the string. According to the invention, a generally longitudinally arranged, linear array of recirculating rollable bearing elements, preferably ball bearings, projects radially outwardly from a well string member so as to reduce primarily lineal friction. A plurality of such linear arrays of recirculating rollable bearing elements are regularly spaced about the periphery of the string at each of a series of locations along the string, and at each such location the arrays are provided in a bearing cage which may be connected to the string through annular rollable bearing means for reducing rotational friction. The bearing cages containing the linear arrays of recirculating rollable bearing elements may be mounted on separate subs or attached over the string.

REFERENCES:
patent: 2599969 (1952-06-01), Bajulaz
patent: 3298243 (1967-01-01), Geissler et al.
patent: 4206951 (1980-06-01), Ernst et al.

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