Thick pointed superhard material

• US 8,028,774 B2
• Filed: 11/25/2009
• Issued: 10/04/2011
• Est. Priority Date: 10/26/2006
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Crockett, Ronald B., Hall, David R., Jepson, Jeff, Dahlgren, Scott, Bailey, John
• Primary Examiner(s): Neuder; William P
• Assistant Examiner(s): Harcourt; Brad
• Application Number:
  US12/625,728
• Publication Number:
  US 20100065338A1
• Time in Patent Office: 678 Days
• Field of Search: 175/425, 175/434, 175/435, 299/110, 299/111, 299/113
• US Class Current: 175/434
• CPC Class Codes: E21B 10/5673 having a non planar or non circular cutting face
• CPC Class Codes: E21B 10/5676 having a cutting face with different segments, e.g. mosaic-type inserts
• CPC Class Codes: E21B 10/5735 Interface between the substrate and the cutting element

Abstract

A high impact resistant tool includes a superhard material bonded to a cemented metal carbide substrate at a non-planar interface. The superhard material has a substantially pointed geometry with a sharp apex having a radius of curvature of 0.050 to 0.125 inches. The superhard material also has a thickness of 0.100 to 0.500 inches from the apex to a central region of the cemented metal carbide substrate. The diamond material comprises a 1 to 5 percent concentration of binding agents by weight.

Claims

1. A high impact resistant tool, comprising:

a sintered polycrystalline diamond material bonded to a cemented metal carbide substrate at a non-planar interface, said polycrystalline diamond material including;

a concentration from about 1 percent to about 5 percent of binding agents by weight;

an apex having a central axis, said central axis passing through said cemented metal carbide substrate, said apex having radius of curvature measured in a vertical orientation from said central axis, said radius of curvature being from about 0.050 to about 0.125 inches; and

a thickness from said apex to said non-planar interface from about 0.100 to about 0.500 inches.

2. The high impact resistant tool of claim 1, further comprising a surface from said apex to said non-planar interface, said surface forming an angle from about 35 degrees to about 55 degrees from said central axis.

3. The high impact resistant tool of claim 2, wherein said angle is substantially 45 degrees.

4. The high impact resistant tool of claim 1, further comprising a surface from said apex to said non-planar interface, said surface having a shape selected from a group consisting of a convex surface and a concave surface.

5. The high impact resistant tool of claim 1, wherein said non-planar interface further comprises a tapered surface starting from a cylindrical rim of said cemented metal carbide substrate and ending at an elevated flatted central region formed in said cemented metal carbide substrate.

6. The high impact resistant tool of claim 5, wherein said flatted central region has a diameter from about 0.125 to about 0.250 inches.

7. The high impact resistant tool of claim 5, wherein said tapered surface is selected from a group consisting of a concave surface and a convex surface.

8. The high impact resistant tool of claim 5, wherein said tapered surface includes at least one of nodules, grooves, dimples, protrusions, and reverse dimples.

9. The high impact resistant tool of claim 1, wherein said radius of curvature is from about 0.090 to about 0.110 inches.

10. The high impact resistant tool of claim 1, wherein said thickness from said apex to said non-planar interface is from about 0.125 to about 0.275 inches.

11. The high impact resistant tool of claim 1, further comprises a total thickness from said polycrystalline diamond material to a base of said cemented metal carbide substrate from about 0.200 to about 0.700 inches.

12. The high impact resistant tool of claim 1, wherein said sintered polycrystalline diamond material is selected from a group consisting of synthetic diamond, silicon bonded diamond, cobalt bonded diamond, thermally stable diamond, polycrystalline diamond with a binder concentration of 1 to 40 weight percent, infiltrated diamond, layered diamond, monolithic diamond, polished diamond, course diamond, fine diamond, and metal catalyzed diamond.

13. The high impact resistant tool of claim 1, wherein a volume of said polycrystalline diamond material is from about 75 percent to about 150 percent of a volume of said cemented metal carbide substrate.

14. The high impact resistant tool of claim 1, wherein said high impact tool is incorporated in drill bits, percussion drill bits, roller cone bits, shear bits, milling machines, indenters, mining picks, asphalt picks, cone crushers, vertical impact mills, hammer mills, jaw crushers, asphalt bits, chisels, and trenching machines.

15. The high impact resistant tool of claim 1, wherein said cemented metal carbide substrate is bonded to an end of a carbide segment.

16. The high impact resistant tool of claim 1, wherein said polycrystalline diamond material is a polycrystalline structure with an average grain size of 1 to 100 microns.

17. The high impact resistant tool of claim 1, wherein said cemented metal carbide substrate includes from about 5 percent to about 10 percent concentration of cobalt by weight.