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US 2003/0150611 A1Published application
Minimum clearance bow-spring centralizer
AssigneeFrank's International, LLC
InventorJean Buytaert
Life of this patent
Estimating the term…
Abstract
A centralizer apparatus for centralizing tubular casing in a borehole having two stop collars for securing to the casing in a spaced apart relationship and two moving collars, one slidably and rotatably coupled to each stop collar, a plurality of bow springs, each bow spring having a first end spaced apart from a second end, each bow spring biased outwardly from the center axis, the first ends connected to the first moving collar, the second ends connected to the second moving collar.
Claims14
A centralizer comprising:
- a plurality of bow springs coupled between first and second moving collars, the bow springs being characterized by a deployed condition and an elongated condition;
- and
- first and second stop collars slidably and rotatably coupling to the first and second moving collars and adapted to be securable to a tubular member, wherein the stop collars limit the longitudinal travel of the moving collars when biased toward the opposing stop collar, yet the stop collars allow the moving collars limited movement away from the opposing stop collar to allow the bow springs to radially inwardly collapse to their elongated condition.
A centralizer comprising:
- a first stop collar spaced apart from a second stop collar and each adapted for securing to a tubular member;
- a first moving collar slidably and rotatably coupled to the first stop collar;
- a second moving collar slidably and rotatably coupled to the second stop collar;
- and
- a plurality of flexible bow springs, each having a first end and a second end, the first end of each bow spring coupled to the first moving collar and the second end of each bow spring coupled to the second moving collar, thereby maintaining the first moving collar and the second moving collar in a variable spaced apart relationship one from the other, each bow spring further having a radially outwardly deployed configuration and a radially flattened configuration.
2 more elements
A centralizer comprising:
- a first stop collar adapted for slidably and rotatably receiving a first moving collar;
- a second stop collar adapted for slidably and rotatably receiving a second moving collar;
- a first flange bore in the first stop collar adapted for slidably and rotatably receiving a flange on the first moving collar, the first flange bore having a stop wall disposed toward the second stop collar;
- a second flange bore in the second stop collar adapted for slidably and rotatably receiving a flange on the second moving collar, the second flange bore having a stop wall disposed toward the first stop collar;
- and
- a plurality of bow springs, each bow spring having a first end spaced apart from a second end, each first end of each bow spring coupled to the first moving collar and each second end of each bow spring coupled to the second moving collar, each bow spring biasing the flange on the first moving collar toward the stop wall in the first flange bore and the flange on the second moving collar toward the stop wall in the second flange bore.
3 more elements
A centralizer comprising:
- a first displacement assembly having a stop collar and a moving collar spaced apart from a second displacement assembly having a stop collar and a moving collar, each displacement assembly having a bore therethrough for receiving a tubular member;
- each moving collar having a flange slidably and rotatably received within a reciprocating bore in the stop collar for coupling of the moving collar to the stop collar;
- a plurality of bow springs, each having a first end coupled to the moving collar of the first displacement assembly and a second end coupled to the moving collar of the second displacement assembly, each bow spring radially outwardly biased away from the center of the bore;
- wherein the longitudinal expansion of the bow springs upon being radially inwardly displaced toward the center of the bore moves the moving collar of the first displacement assembly to a position further from the moving collar of the second displacement assembly.
1 more element
A centralizer comprising:
- a first stop collar adapted for slidably and rotatably coupling to a first moving collar;
- a second stop collar adapted for slidably and rotatably coupling to a second moving collar;
- a first flange bore in the first moving collar adapted for slidably and rotatably receiving a flange on the first stop collar, the first flange bore having a stop wall disposed toward the first stop collar;
- a second flange bore in the second moving collar adapted for slidably and rotatably receiving a flange on the second stop collar, the second flange bore having a stop wall disposed toward the second stop collar;
- and
- a plurality of bow springs, each bow spring having a first end spaced apart from a second end, each first end of each bow spring coupled to the first moving collar and each second end of each bow springs coupled to the second moving collar, each bow spring braising the flange on the first stop collar toward the stop wall in the first flange bore and biasing the flange on the second stop collar toward the stop wall of the second flange bore.
3 more elements
Dependencies are inferred from the claim text.