Centralizer for use with wellbore drill collar

Patent metadata

Field	Value
Publication number	US-9657537-B2
Application number	US-201514913797-A
Country	US
Kind code	B2
Filing date	Aug 18, 2015
Priority date	Sep 19, 2014
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A centralizer includes one or more centralizer fins radially extending from a body of the centralizer. The centralizer fins may include one or more chambers extending through the outer surfaces of the centralizer fins. The one or more chambers may change shape in response to a compression force being applied to the centralizer fins to cause the centralizer fins to deform. The centralizer fins may be deformed for installation of the centralizer in a drill collar. The centralizer may also include a split-ring clamp for coupling the centralizer to a drilling tool positioned in a through-bore of the centralizer body. The split-ring clamp may apply a load on the drilling tool in response to an end cap being torqued to an end portion of the centralizer body.

First claim

What is claimed is:

1. A centralizer comprising:
a centralizer body including a through-bore for receiving a drilling component; and
a centralizer fin radially extending from the centralizer body, the centralizer fin including one or more chambers defined therein that extend from a first outer surface to a second outer surface of the centralizer fin along an axis that is perpendicular to a longitudinal axis of the centralizer body, the one or more chambers being responsive to a compression force on the centralizer fin in positioning the centralizer internally to a drill collar by changing shape such that the centralizer fin deforms.

2. The centralizer of claim 1 , wherein the centralizer fin is made from a material, wherein the one or more chambers are devoid of the material.

3. The centralizer of claim 2 , wherein the material comprises a rubber material or a plastic material.

4. The centralizer of claim 1 , wherein the one or more chambers comprises a plurality of chambers including a center chamber and an end chamber, each of the center chamber and the end chamber having an oblong shape with a flat edge, wherein the center chamber is positioned in the centralizer fin to create a parallel relationship between the flat edge of the center chamber and an end surface of the centralizer fin, wherein the end chamber is positioned in the centralizer fin to create an angled relationship between the flat edge of the end chamber and the end surface of the centralizer fin.

5. The centralizer of claim 1 , further comprising a split-ring clamp positionable proximate to an end portion of the centralizer body to prevent axial movement of the centralizer body, wherein the split-ring clamp is compressible around the drilling component in response to an end cap being positioned external to the split-ring clamp and torqued to the end portion of the centralizer body subsequent to the drilling component being positioned in the through-bore.

6. The centralizer of claim 5 , wherein the split-ring clamp includes a tapered edge for mating with a corresponding tapered edge of the end cap to prevent the axial movement of the centralizer body subsequent to the end cap being torqued to the end portion of the centralizer body.

7. The centralizer of claim 5 , further including the end cap having a passage for receiving the split-ring clamp, the end cap including a tapered edge for mating with a corresponding tapered edge of the split-ring clamp to couple the split-ring clamp and the centralizer body to the drilling component subsequent to the end cap being torqued to the end portion of the centralizer body.

8. The centralizer of claim 1 , wherein the centralizer fin is positionable to contact an inner surface of the drill collar in response to a removal of the compression force to reduce vibrations in the drill collar during operation of a drill string.

9. The centralizer of claim 1 , wherein the centralizer fin is positionable internal to the drill collar to reduce vibrations of one or more components of a drill string during operation of the drill string.

10. A centralizer assembly, comprising:
a drill collar;
a centralizer including:
a centralizer body having a through-bore, and
one or more centralizer fins radially extending from the centralizer body and having a plurality of chambers defined therein, the plurality of chambers being responsive to a compression force on the one or more centralizer fins in positioning the centralizer internally to the drill collar by changing shape such that the one or more centralizer fins deform; and

a split-ring clamp positionable proximate to the centralizer body and compressible around a drilling component positioned in the through-bore of the centralizer body.

11. The centralizer assembly of claim 10 , wherein the one or more centralizer fins are positionable to contact an inner surface of the drill collar in response to a removal of the compression force to reduce vibrations in the drill collar during operation of a drill string.

12. The centralizer assembly of claim 10 , wherein the one or more centralizer fins are made from a material comprising rubber or plastic, wherein the plurality of chambers are devoid of the material.

13. The centralizer of claim 10 , wherein the plurality of chambers including one or more center chambers and at least two end chambers positioned in at least one of the one or more centralizer fins, each of one or more center chamber and the at least two end chambers having an oblong shape with a flat edge, wherein the one or more center chambers are positioned in the least one of the one or more centralizer fins to create a parallel relationship between the flat edge of each of the one or more center chambers and an end surface of the least one of the one or more centralizer fins, wherein each of the at least two end chambers is positioned in the least one of the one or more centralizer fins to create an angled relationship between the flat edge of each of the at least two end chambers and the end surface of the least one of the one or more centralizer fins.

14. The centralizer of claim 10 , wherein the split-ring clamp includes a split for allowing the split-ring clamp to compress around the drilling component and for applying a load to the drilling component when the split-ring clamp is compressed around the drilling component.

15. The centralizer assembly of claim 10 , further comprising an end cap for compressing the split-ring clamp around a part of the drilling component, the end cap including a tapered edge for mating with a corresponding tapered edge of the split-ring clamp by torquing the end cap to an end portion of the centralizer body.

16. A method for installing a centralizer in a drill collar, comprising:
providing the centralizer having one or more centralizer fins extending from a centralizer body of the centralizer;
applying a compression force on the one or more centralizer fins to deform the one or more centralizer fins based on a position of one or more chambers in the one or more centralizer fins;
positioning the centralizer internal to the drill collar; and
removing the compression force to allow each of the one or more centralizer fins to contact an inner surface of the drill collar.

17. The method of claim 16 , further comprising:
positioning a split-ring clamp proximate to an end portion of the centralizer body and around a drilling component positioned in a through-bore of the centralizer body;
positioning the split-ring clamp internal to a passage of an end cap;
torquing the end cap to the end portion of the centralizer body to allow the split-ring clamp to apply a load on the drilling component.

18. The method of claim 17 , wherein torquing the end cap to the end portion of the centralizer body includes mating a tapered edge of the end cap with a corresponding tapered edge of the split-ring clamp.

19. The method of claim 16 , wherein the one or more chambers are positioned to extend from a first outer surface of the one or more centralizer fins to a second outer surface of the one or more centralizer fins, wherein applying the compression force on the one or more centralizer fins causes a shape of at least one of the one or more chambers to change.

20. The method of claim 16 , wherein applying the compression force on the one or more centralizer fins includes deforming the one or more centralizer fins to produce a compressed centralizer having an outer diameter that is less than an inner diameter of the drill collar.

Assignees

• Halliburton Energy Services Inc

Inventors

• Riley Benjamin Scott
• Carter Daniel Patrick
• Sona Anup

Classifications

• E21B17/1042 Primary

  Elastomer protector or centering means · CPC title

• E21B17/16

  Drill collars · CPC title

• E21B17/105

  split type · CPC title

• E21B17/1078 Primary

  Stabilisers or centralisers for casing, tubing or drill pipes (E21B17/1007 - E21B17/1064 take precedence) · CPC title