Cutting elements for earth-boring tools and earth-boring tools including such cutting elements
Cutting elements, earth-boring drill bits having such cutting elements and related methods include a cutting element having a superabrasive table positioned on a substrate, and at least one recessed surface in a cutting face of the superabrasive table.
1. A cutting element for a wellbore tool, comprising:
a superabrasive table defining:
a right circular cylindrical lateral side surface of the cutting element; and
a cutting face of the cutting element, the cutting face comprising a planar first surface and a planar second surface;
wherein the planar second surface has a noncircular shape; and
wherein the planar second surface is completely surrounded by and recessed below the planar first surface.
2. The cutting element of claim 1 , wherein the planar first surface is parallel to the planar second surface, the cutting element further comprising an angled surface extending between the planar first surface and the planar second surface, the angled surface comprising at least one arc.
3. The cutting element of claim 1 , wherein the planar second surface has a surface roughness less than about 10 μin. RMS.
4. The cutting element of claim 3 , wherein the planar second surface has a surface roughness less than about 2 μin. RMS.
5. The cutting element of claim 4 , wherein the planar second surface has a surface roughness less than about 0.5 μin. RMS.
6. The cutting element of claim 1 , wherein the superabrasive table comprises polycrystalline diamond.
7. The cutting element of claim 1 , wherein the superabrasive table is bonded to a substrate.
8. The cutting element of claim 1 , wherein the superabrasive table defines a chamfer surface intersecting the planar first surface of the cutting face and the lateral side surface of the cutting element.
9. The cutting element of claim 1 , wherein the planar first surface is parallel to the planar second surface, and wherein the cutting face comprises at least one angled surface extending between the planar first surface and the planar second surface.
10. The cutting element of claim 1 , wherein a minimum distance between the planar second surface and the lateral side surface is greater than 0.254 mm and varies around a perimeter of the cutting element.
11. A wellbore tool, comprising:
a body carrying at least one cutting element, the at least one cutting element comprising a superabrasive table defining:
a right circular cylindrical lateral side surface of the cutting element; and
a cutting face of the cutting element, the cutting face comprising a planar first surface and a planar second surface;
wherein the planar second surface has a noncircular shape; and
wherein the planar second surface is completely surrounded by and recessed below the planar first surface.
12. The wellbore tool of claim 11 , wherein a portion of the planar first surface is configured to contact a surface of an earth formation when the wellbore tool is rotated within a wellbore adjacent the earth formation.
13. The wellbore tool of claim 11 , further comprising a depth-of-cut limiting feature positioned on the body to inhibit interaction between an earth formation and the planar second surface when the wellbore tool is rotated within a wellbore adjacent the earth formation.
14. The wellbore tool of claim 11 , wherein the body comprises a fixed-cutter rotary drill bit having a plurality of blades, and wherein the cutting element is secured to a blade of the plurality of blades.
15. A cutting element for an earth boring tool, comprising:
a superabrasive table defining:
a right circular cylindrical lateral side surface of the cutting element; and
a cutting face of the cutting element, the cutting face comprising a planar first surface and a planar second surface;
wherein the planar second surface has a noncircular shape;
wherein the planar second surface is completely surrounded by and recessed below the planar first surface;
wherein the planar second surface is parallel to the planar first surface; and
wherein the planar second surface intersects a longitudinal axis at a center of the cutting element.
16. The cutting element of claim 15 , wherein the cutting face comprises at least one angled surface extending between the planar first surface and the planar second surface.
17. The cutting element of claim 16 , wherein the angled surface comprises at least one arc.
18. The cutting element of claim 17 , wherein the angled surface comprises a Reuleaux polygon.
19. The cutting element of claim 15 , wherein the superabrasive table comprises polycrystalline diamond.