Dual diameter centralizer/sub and method
AssigneeCaseTech International, Inc.
InventorMaximillian S. Gremillion
Life of this patent
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Abstract
A dual diameter centralizing sub for maintaining stand-off and/or centralizing a tubular member inside a larger diameter tubular member, for instance, in a wellbore. The centralizer is provided with bow springs that compress into grooves between radially outwardly-extending vanes that are spaced around the outer diameter of the sub when compressive force is applied to the bow springs. The vanes extend radially outwardly far enough that the effective diameter of the sub in the area of the vanes is greater than the diameter of the sub and/or the tubing to which it is mounted to provide stand-off even under conditions in which the bow springs are fully compressed.
Claims22
A centralizer comprising:
- a body;
- a plurality of radially outwardly extending vanes on said body;
- a collar mounted on said body;
- and
- a plurality of bow springs mounted to said collar, said bow springs being maintained in spaced relation to said vanes whereby one or more of said bow springs moves between a first, bowed position standing off from said body to a second compressed position between said vanes and closer to said body.
A centralizer comprising an elongate body having a plurality of vanes extending radially outwardly therefrom and forming a plurality of grooves therebetween, a collar mounted on said body, and a plurality of bow springs mounted to said collar, said bow springs being compressible from a first, bowed position to a second, compressed position closer to said body, said bow springs being positioned in the grooves between vanes when in the second, compressed position.
Dependencies are inferred from the claim text.