Well tool

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E - Fixed Constructions

21

B

166/71

E21B 17/10 (2006.01)

Patent

CA 2017997

A centralizes for the rods of a pump rod string for holding the rods in central longitudinal alignment with and in the tubing. When installed on a rod there is an upper pair of ribs extending outwardly in radially opposite directions from the longitudinal direction of the rod and a lower pair of ribs extending outwardly in radially opposite directions from the longitudinal direction of the rod and the upper and lower pairs extending in generally orthogonal directions to each other. Preferrably there is an intermediate portion between the ribs of smaller external diameter thereof.

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