US 12,305,452 B2
Centralizer having internal stop collar
Darko Arsoski, Angus (GB); Douglas Brian Farley, Missouri City, TX (US); and Shenal Mekson, Antioch, IL (US)
Assigned to DOWNHOLE PRODUCTS LIMITED
Filed by DOWNHOLE PRODUCTS LIMITED, Aberdeen (GB)
Filed on Jul. 16, 2024, as Appl. No. 18/773,846.
Claims priority of provisional application 63/587,459, filed on Oct. 3, 2023.
Prior Publication US 2025/0109640 A1, Apr. 3, 2025
Int. Cl. E21B 17/10 (2006.01); E21B 17/00 (2006.01)
CPC E21B 17/1078 (2013.01) [E21B 17/006 (2013.01); E21B 17/1028 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A centralizer for mounting onto a downhole tubular, comprising:
a cylindrical body having:
a plurality of blades forming a periphery thereof,
a first portion with an inner surface, and
a second portion having a groove formed in an inner surface thereof for receiving a stop collar; and
the stop collar, comprising:
a compressible slip ring having teeth formed in an inner surface thereof and a pair of tapered outer surfaces, and
a pair of cam rings, each cam ring having a tapered inner surface, wherein:
an outer diameter of each cam ring is greater than a diameter of the inner surface of the first portion and less than a diameter of the groove,
an assembly tool is operable to drive the tapered surfaces together, thereby compressing the slip ring such that the teeth engage a periphery of the downhole tubular,
the body further has a third portion having a constant and reduced inner diameter relative to the second portion,
the second portion is located between the first and third portions,
the groove is bounded by a pair of stop shoulders, and
one of the cam rings engages one of the stop shoulders while driving the tapered surfaces together.