Rolling cutter

Patent metadata

Field	Value
Publication number	US-RE47369-E
Application number	US-201715599194-A
Country	US
Kind code	E1
Filing date	May 18, 2017
Priority date	May 30, 2006
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A cutting element for a drill bit includes an outer support element and an inner rotatable cutting element, a portion of which is disposed in the outer support element, where the inner rotatable cutting element has a body with a non-planar cutting face.

First claim

What is claimed is:

1. A cutting element for a drill bit, comprising:
an outer support element; and
an inner rotatable cutting element, a portion of which is disposed in the outer support element, the inner rotatable cutting element comprising:
a body having a non-planar cutting face;
wherein the body comprises an a single ultra hard material body disposed on an interface surface of a substrate, the ultra hard material body forming the non-planar cutting face; and
wherein a radial bearing is formed between a portion of the ultra hard material body and the outer support element.

2. The cutting element of claim 1 , wherein the ultra hard material body comprises diamond.

3. The cutting element of claim 1 , wherein the outer support element covers a portion of the non-planar cutting face.

4. A cutting element for a drill bit, comprising:
an outer support element;
an inner rotatable cutting element, a portion of which is disposed in the outer support element, the inner rotatable cutting element comprising:
a non-planar cutting face;
a body comprising a shaft portion, the shaft portion having a diameter less than the diameter of the non-planar cutting face; and

an axial bearing formed between a portion of the outer support element and the inner rotatable cutting element.

5. The cutting element of claim 4 , wherein the non-planar cutting face comprises a plurality of surface alterations formed thereon.

6. The cutting structure of claim 5 , wherein the surface alterations have a depth ranging from 0.001 to 0.05 inches.

7. The cutting element of claim 4 , wherein the non-planar cutting face is dome shaped, the dome shape extending across the diameter of the non-planar cutting face.

8. The cutting element of claim 4 , wherein the non-planar cutting face has a convex shape.

9. The cutting element of claim 4 , wherein the cutting element further comprises at least one retention mechanism disposed between the inner rotatable cutting element and the outer support element.

10. A drill bit, comprising:
a bit body having a plurality of blades extending radially from the bit body and axially along a length of the bit body; and
at least one cutting element of claim 4 mounted to at least one of the plurality of blades.

11. The cutting element of claim 4 , wherein the non-planar cutting face is saddle shaped.

12. A cutting structure for a cutting tool, comprising:
an outer support element having a bottom portion and a side portion; and
an inner rotatable cutting element, a portion of which is disposed in the outer support element;
wherein the outer support element further comprises an inner shaft portion extending from the bottom portion into the inner rotatable cutting element.

13. The cutting structure of claim 12 , wherein the inner shaft portion is threadedly attached to the bottom portion.

14. The cutting structure of claim 12 , wherein the inner shaft portion is integral with the bottom portion.

15. The cutting structure of claim 12 , wherein an upper end of the inner shaft portion extends partially over a cutting face of the inner rotatable cutting element.

16. The cutting structure of claim 12 , wherein at least a portion of a bearing surface of the outer support element comprises a lubricious material.

17. The cutting structure of claim 12 , wherein the outer support element is integral with a cutting tool body.

18. The cutting structure of claim 12 , wherein at least a side portion of the outer support element is a blade of a cutting tool.

19. The cutting structure of claim 12 , wherein the outer support element is a discrete element.

20. A drill bit, comprising:
a bit body having a plurality of blades extending radially therefrom; and
at least one cutting element of claim 12 mounted to at least one of the plurality of blades.

21. A structure of a cutting tool, comprising:
an outer support element; and an inner rotatable element at least partially within the outer support element, the inner rotatable element including opposing ends that each comprise an ultra hard material portion.

22. The structure of claim 21, the inner rotatable element further including at least one substrate portion between the ultra hard material portions of the opposing ends of the inner rotatable element.

23. The structure of claim 21, wherein the inner rotatable element includes a side surface extending between the ultra hard material portions of the opposing ends, and wherein at least a portion of the side surface of the inner rotatable element includes an ultra hard material.

24. The structure of claim 23, wherein the ultra hard material of the side surface is distinct from the ultra hard material portions of the opposing ends of the inner rotatable element.

25. The structure of claim 23, wherein the ultra hard material of the side surface is on a circumferential bearing surface.

26. The structure of claim 23, wherein the ultra hard material of the side surface forms a continuous circumferential bearing surface around the inner rotatable element.

27. The structure of claim 23, wherein the ultra hard material of the side surface includes discrete ultra hard segments positioned a circumference of the inner rotatable element.

28. The structure of claim 23, wherein the ultra hard material of the side surface is in an ultra hard material layer extending a full diameter of the inner rotatable element.

29. The structure of claim 21, wherein the outer support element is integral with and defined by a cutting tool.

30. The structure of claim 21, wherein the outer support element comprises at least a first portion that covers a portion of a side surface of the inner rotatable element and a second portion that covers at least a portion of a first end of the opposing ends of the inner rotatable element.

31. The structure of claim 21, wherein the outer support element covers at least a portion of each of the opposing ends of the inner rotatable element, and the outer support element extends a full length of the inner rotatable element and covers a full length of a portion of a side surface of the inner rotatable element.

32. The structure of claim 31, wherein a portion of the side surface and at least a portion of one of the opposing ends are exposed while the inner rotatable element is within the outer support element.

33. The structure of claim 21, wherein the inner rotatable element is a cylindrical body having a substantially constant diameter along its entire length.

34. A cutting tool, comprising:
a tool body, the tool body including at least one radially extending blade; and at least one pocket formed in the at least one blade, at least one rolling element retained in the at least one pocket such that the at least one rolling element is free to rotate about an axis of the at least one rolling element, the at least one rolling element including opposing end faces and ultra hard material at each of the opposing end faces.

35. The cutting tool of claim 34, wherein the at least one rolling element includes a side surface between ultra hard material portions at the opposing end faces, and wherein at least a portion of the side surface of the inner rotatable element comprises an ultra hard material on an outer circumference of the side surfac

Assignees

• Smith International

Inventors

• Shen Yuelin
• Zhang Youhe
• Yong Zhou
• Yu Jiaqing
• Keshavan Madapusi K

Classifications

• E21B10/52

  with chisel- or button-type inserts · CPC title

• Y10T29/49947

  by applying separate fastener · CPC title

• E21B10/573

  characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element · CPC title

• E21B10/5673 Primary

  having a non planar or non circular cutting face · CPC title

• Y10T29/49963

  Threaded fastener · CPC title