System, method and apparatus for scale resistant radial...

Wells – With below and above ground modification – Eduction pump or plunger in well

Reexamination Certificate

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C166S105500

Reexamination Certificate

active

07909090

ABSTRACT:
Radial bearing designs for electrical submersible pump components and assemblies reduces scale build up on the bearing components. Scale resistant and abrasive resistant sleeves and bushings may be used. The axial lengths of the sleeves are kept within the axial length of the AR bushings, or vice versa, with regard to the axial stroke of one component relative to the other. In addition, sharp corners may be formed on the sleeve or bushing axial faces at their respective interfacing diameters. As the shaft moves axially, the sharp corner on one component scrapes off the scale on the other component. This design discards the scale rather than force it into the clearance between the sleeve and bushing. Small spacer sleeves also may be used adjacent the sleeves so that scale build up on the spacer sleeves is farther away from the bearing to reduce scale-related problems.

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