Drill bit and cutting element having multiple cutting edges
AssigneeSmith International, Inc.
InventorSharath K. Kolachalam
Life of this patent
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Abstract
A drill bit for cutting a borehole through an earthen formation comprises a bit body having a bit axis. In addition, the drill bit comprises a rolling cone cutter mounted on the bit body and adapted for rotation about a cone axis. Further, the drill bit comprises an insert having a base portion secured in the rolling cone cutter and having a cutting portion extending therefrom, the insert having an initial impact direction. The cutting portion of the insert has a cutting surface comprising a planar surface defining an extension height. Moreover, the cutting portion of the insert comprises an indentation extending at least partially through the upper planar surface, the indentation including a forward facing formation engaging surface and a lower surface defining a depth of the indentation.
Claims46
A cutting element for a drill bit comprising:
- a base portion having a base axis and an outer surface;
- a cutting portion extending from the base portion and having a cutting surface, wherein a first reference plane parallel to and passing through the base axis divides the cutting surface into a leading section and a trailing section;
- wherein the cutting surface includes an upper substantially planar surface defining a first extension height and a beveled surface on the leading side disposed between the upper planar surface and the outer surface of the base portion;
- a first notch in the leading section of the cutting surface extending at least partially through the upper planar surface and the beveled surface, wherein the first notch includes a forward facing formation engaging surface.
A cutting element for a drill bit comprising:
- a base portion having a base axis and an outer surface;
- a cutting portion extending from the base portion and having a cutting surface, wherein the cutting surface includes a planar upper surface defining an extension height and a radiused transition surface disposed between the upper planar surface and the outer surface of the base portion;
- an indentation formed in the cutting surface and extending at least partially through the upper planar surface and the transition surface;
- and
- wherein the indentation includes a forward facing formation engaging surface and a lower surface defining a depth of the indentation measured perpendicularly from the upper planar surface.
A drill bit for cutting a borehole through an earthen formation having a sidewall, corner and bottom, the bit comprising:
- a bit body having a bit axis;
- a rolling cone cutter mounted on the bit body and adapted for rotation about a cone axis;
- an insert having a base portion secured in the rolling cone cutter and having a cutting portion extending therefrom, the insert having an initial impact direction;
- wherein the cutting portion has a cutting surface comprising:
- a planar surface defining an extension height;
- an indentation extending at least partially through the upper planar surface, the indentation including a forward facing formation engaging surface, a trailing cutting edge, a leading cutting edge, and a lower surface defining a depth of the indentation.
Dependencies are inferred from the claim text.