Rock Bit and Inserts With Wear Relief Grooves
AssigneeSmith International, Inc.
InventorsBryce A. Baker, Amardeep Singh
Life of this patent
Estimating the term…
Abstract
A rolling cone drill bit includes at least one cutter element comprising a base portion and a cutting portion extending from the base portion. The cutting portion includes a cutting surface with an apex defining an extension height and at least one rib extending from the apex toward the base portion. In addition, the at least one rib has a convex outer surface in profile view.
Claims33
A cutter element for a drill bit, comprising:
- a base portion;
- a cutter element axis;
- a cutting portion extending from the base portion and having a cutting surface with an apex;
- wherein the cutting surface comprises at least one rib extending from the apex toward the base portion and a continuously contoured concave depression positioned adjacent the at least one rib between the apex and the base portion;
- and
- wherein the at least one rib has a continuously contoured convex outer surface in profile view.
A cutter element for use in a rolling cone drill bit, comprising:
- a base portion;
- a cutting portion extending from the base portion and having a cutting surface with an apex, wherein the cutting surface includes a plurality of ribs, each rib radiating from the apex and extending toward the base portion;
- wherein at least one of the plurality of ribs has a continuously contoured outer surface in profile view, and a pair of arcuate lateral sides in top axial view.
A rolling cone drill bit for drilling a borehole in earthen formations, the bit comprising:
- a bit body having a bit axis;
- at least one rolling cone cutter mounted on the bit body for rotation about a cone axis and having a first surface for cutting the borehole bottom and second surface for cutting the borehole sidewall;
- a plurality of cutter elements secured to the cone cutter and extending from the first surface;
- wherein at least one of the cutter elements comprises:
- a base portion;
- a cutting portion extending from the base portion, wherein the cutting portion includes a cutting surface with an apex defining an extension height and at least one rib extending from the apex toward the base portion;
- and
- wherein the at least one rib has a continuously contoured convex outer surface in profile view.
A rolling cone drill bit for drilling through earthen formations to form a borehole with a hole bottom and a sidewall, the drill bit comprising:
- at least one rolling cone cutter rotatably mounted on a bit body, the rolling cone cutter including a first surface generally facing the borehole bottom and a second surface generally facing the sidewall of the borehole;
- at least one cutter element mounted in the rolling cone cutter and secured in a position to cut against the borehole bottom;
- wherein the at least one cutter element comprises:
- a base portion;
- a cutting portion having a cutting surface extending from the base portion to a continuously contoured tip;
- wherein the cutting surface includes a plurality of ribs disposed between the tip and the base portion;
- wherein each rib has a continuously contoured outer surface in profile view;
- and
- wherein each rib has a pair of arcuate lateral sides in top axial view.
Dependencies are inferred from the claim text.