Methods of repairing cutting element pockets in earth-boring tools with depth-of-cut control features

Patent metadata

Field	Value
Publication number	US-9291002-B2
Application number	US-201514602012-A
Country	US
Kind code	B2
Filing date	Jan 21, 2015
Priority date	Apr 15, 2009
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

Methods of repairing earth-boring tools may involve providing wear-resistant material over a temporary displacement member to repair a cutting element pocket in a body and a depth-of-cut control feature using the wear-resistant material. In some embodiments, the wear-resistant material may comprise a particle-matrix composite material. For example, a hardfacing material may be built up over a temporary displacement member to form or repair a cutting element pocket and provide a depth-of-cut control feature. Earth-boring tools may include a depth-of-cut control feature comprising a wear-resistant material. The depth-of-cut control feature may be configured to limit a depth-of-cut of a cutting element secured within a cutting element pocket partially defined by at least one surface of the depth-of-cut control feature. Intermediate structures formed during fabrication of earth-boring tools may include a depth-of-cut control feature extending over a temporary displacement member.

First claim

What is claimed is:

1. A method of repairing an earth-boring tool, comprising:
removing a cutting element from a cutting element pocket in a body of the earth-boring tool;
inserting a temporary displacement member into the cutting element pocket in the body of the earth-boring tool;
providing a depth-of-cut control feature comprising a particle-matrix composite material over a portion of a surface of the temporary displacement member, the depth-of-cut control feature bonded to the body of the earth-boring tool proximate the temporary displacement member, including forming the depth-of-cut control feature to have a size and shape configured to limit a depth-of-cut of another cutting element to be secured within the cutting element pocket;
removing the temporary displacement member from the cutting element pocket; and
securing the other cutting element within the cutting element pocket.

2. The method of claim 1 , wherein providing the depth-of-cut control feature comprising the particle-matrix composite material comprises depositing a hardfacing material over the portion of the surface of the temporary displacement member and over the body of the earth-boring tool proximate the temporary displacement member.

3. The method of claim 1 , wherein forming the depth-of-cut control feature to have the size and shape configured to limit the depth-of-cut of the other cutting element to be secured within the cutting element pocket comprises building up the particle-matrix composite material to a predetermined height above the surface of the body of the earth-boring tool adjacent to the cutting element pocket.

4. The method of claim 3 , further comprising forming the depth-of-cut control feature to exhibit a predetermined minimum surface area at the predetermined height above the surface of the body of the earth-boring tool adjacent to the cutting element pocket.

5. The method of claim 3 , further comprising a backup cutting element secured to the body and wherein building up the particle-matrix composite material to the predetermined height above the surface of the body of the earth-boring tool adjacent to the cutting element pocket comprises building up the particle matrix composite material to the predetermined height between a first exposure of the cutting element and a second exposure of the backup cutting element or equal to the second exposure of the backup cutting element.

6. The method of claim 1 , further comprising selecting the temporary displacement member to comprise at least one of aluminum oxide and silicon oxide.

7. The method of claim 1 , wherein providing the depth-of-cut control feature over the portion of the surface of the temporary displacement member comprises providing the depth-of-cut control feature over at least 50% of a surface area of a side surface of the temporary displacement member.

8. The method of claim 1 , further comprising temporarily securing the temporary displacement member in the cutting element pocket utilizing an adhesive material.

9. The method of claim 1 , wherein removing the temporary displacement member from the cutting element pocket comprises fracturing the temporary displacement member to remove the temporary displacement member from the cutting element pocket.

10. The method of claim 1 , wherein the earth-boring tool comprises blades extending longitudinally and radially outward from a remainder of the body and further comprising:
removing a cutting element from a cutting element pocket in each blade of the body of the earth-boring tool;
inserting a temporary displacement member into the respective cutting element pocket in each respective blade of the body of the earth-boring tool;
providing a depth-of-cut control feature comprising a particle-matrix composite material over a portion of a surface of each respective temporary displacement member, each respective depth-of-cut control feature bonded to each respective blade of the body of the earth-boring tool proximate each respective temporary displacement member, including forming each depth-of-cut control feature to have a size and shape configured to limit a depth-of-cut of each respective other cutting element to be secured within each respective cutting element pocket;
removing each temporary displacement member from each respective cutting element pocket; and
securing each respective other cutting element within each respective cutting element pocket.

11. The method of claim 1 , wherein the earth-boring tool comprises blades extending longitudinally and radially outward from a remainder of the body and further comprising:
removing each cutting element from each respective cutting element pocket in each blade of the body of the earth-boring tool;
inserting a temporary displacement member into each respective cutting element pocket in each respective blade of the body of the earth-boring tool;
providing a depth-of-cut control feature comprising a particle-matrix composite material over a portion of a surface of each respective temporary displacement member, each respective depth-of-cut control feature bonded to each respective blade of the body of the earth-boring tool proximate each respective temporary displacement member, including forming each depth-of-cut control feature to have a size and shape configured to limit a depth-of-cut of each respective other cutting element to be secured within each respective cutting element pocket;
removing each temporary displacement member from each respective cutting element pocket; and
securing each respective other cutting element within each respective cutting element pocket.

12. A method of repairing an earth-boring tool, comprising:
removing a cutting element from a cutting element pocket in a body of the earth-boring tool;
inserting a temporary displacement member into the cutting element pocket in the body of the earth-boring tool;
depositing a volume of hardfacing material over an area of a surface of the body of the earth-boring tool adjacent to the cutting element pocket and over a portion of a surface of the temporary displacement member to repair the cutting element pocket and form a depth-of-cut control feature from the hardfacing material;
removing the temporary displacement member from the cutting element pocket; and
securing another cutting element within the cutting element pocket.

13. The method of claim 12 , wherein depositing the volume of the hardfacing material over the temporary displacement member comprises building up the hardfacing material to a predetermined height above the surface of the body of the earth-boring tool adjacent to the cutting element pocket.

14. The method of claim 13 , further comprising forming the depth-of-cut control feature to exhibit a predetermined minimum surface area at the predetermined height over the surface of the body of the earth-boring tool adjacent to the cutting element pocket.

15. The method of claim 13 , further comprising a backup cutting element secured to the body and wherein building up the particle-matrix composite material to the predetermined height above the surface of the body of the earth-boring tool adjacent to the cutting element pocket comprises building up the particle-matrix composite material to the predetermined height between a first exposure of the cutting element and a second exposure of the backup cutting element or equal to the second exposure of the backup cutting element.

16. The method of claim 12 , wherein providing the depth-of-cut control feature over the portion of the surface of the temporary displacement member comprises providing the depth-of-cut control f

Assignees

• Baker Hughes Inc

Inventors

• Overstreet James L
• Gilmore Kenneth E
• Puzz Travis E

Classifications

• B23P15/28

  cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00) · CPC title

• E21B10/43

  characterised by the arrangement of teeth or other cutting elements · CPC title

• Y10T29/49982

  Coating · CPC title

• Y10T29/49885

  with coating before or during assembling · CPC title

• E21B10/62 Primary

  characterised by parts, e.g. cutting elements, which are detachable or adjustable (E21B10/64 takes precedence; for roller bits E21B10/20; for augers E21B10/44) · CPC title