Abstract: A conduit centralizer comprises segmented, sliding upper and lower collars connected by a plurality of axially extending, outwardly bowed leaf springs. Each collar is formed by the hinged connection on a plurality of segments in close fitting contact with the outer diameter of a pipe. The ends of the leaf springs are respectively inserted within the individual segments and welded to the segments. Individual collar segment sections or subassemblies comprising upper and lower collar segments secured to a single intermediate bowed leaf spring can then be interconnected to form a concentric centralizer.

Abstract: A centering device is provided which is adapted to be mounted on a running-in string for subsequent disposal in a well bore. Upper and lower companion supporting members having a plurality of circumferentially spaced openings therein and shoulders circumferentially extending around the uppermost interior of each of the supporting members are provided for receipt of circumferentially spaced and outwardly bowed springs having upper and lower ends overlying the lower portion of the exterior of the supporting members and extending inwardly through the openings. The springs have portions disposed in the openings with the upper and lower ends of the springs respectively engaging the upper and lower shoulder of the support members.