Shaped Cutter For Drill Bit With Point-Loaded Reinforcing Ribs
AssigneeHalliburton Energy Services, Inc.
InventorsJohn Harman, William Brian Atkins
Life of this patent
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Abstract
A shaped cutter is disclosed for use on a drill bit. In one or more example, the shaped cutter includes a substrate including a proximal end and a distal end and defining a cutter axis extending between the proximal and distal ends. A cutting table secured to the proximal end of the substrate includes a cutting face with a central boss axially extending from the cutting face and a plurality of ribs radially extending across the cutting face from the boss to a periphery of the cutting table. The cutting face may recede axially from the periphery towards the central boss, such as by defining a planar section, a plurality of intersecting planar sections, and/or a concave (e.g., frustoconical) shape between adjacent ribs.
Claims18
A shaped cutter for a fixed-cutter drill bit, comprising:
- a substrate including a proximal end and a distal end and defining a cutter axis extending between the proximal and distal ends;
- and
- a cutting table secured to the proximal end of the substrate, the cutting table including a cutting face with a central boss axially extending from the cutting face and a plurality of ribs radially extending across the cutting face from the central boss to a periphery of the cutting table, wherein the cutting face recedes axially from the periphery towards the central boss, and wherein the cutting face includes two or more planar sections disposed between each pair of adjacent ribs of the plurality of ribs.
4-5. (canceled)
The shaped cutter of claim 4, wherein a height of the central boss above the cutting face is equal to an expected depth of cut for the cutter.
A fixed cutter drill bit, comprising:
- a bit body defining a bit axis and having a plurality of blades extending therefrom;
- and
- a plurality of cutters secured to the blades, including one or more shaped cutter, wherein each shaped cutter comprises:
- a substrate;
- and
- a cutting table secured to the proximal end of the substrate, the cutting table including a cutting face with a central boss axially extending from the cutting face and a plurality of ribs radially extending across the cutting face from the central boss to a periphery of the cutting table, wherein the cutting face recedes axially from the periphery towards the central boss, and wherein the cutting face includes two or more planar sections disposed between each pair of adjacent ribs of the plurality of ribs.
17-18. (canceled)
A method of drilling, comprising:
- rotating a drill bit about a bit axis, the drill bit having a plurality of cutters, including one or more shaped cutter, each shaped cutter including a substrate and a cutting table secured to the proximal end of the substrate, the cutting table including a cutting face with a central boss axially extending from the cutting face and a plurality of ribs radially extending across the cutting face from the central boss to a periphery of the cutting table, with a tip of one of the ribs positioned to engage the formation, wherein the cutting face recedes axially from the periphery towards the central boss, and wherein the cutting face includes two or more planar sections disposed between each pair of adjacent ribs of the plurality of ribs.
Dependencies are inferred from the claim text.