Cutting structures for fixed cutter drill bit and other downhole cutting tools
AssigneeSmith International, Inc.
InventorsMichael G. Azar, Bala Durairajan, Madapusi K. Keshavan
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Abstract
A downhole cutting tool may include a tool body; a plurality of blades extending azimuthally from the tool body; and a plurality of cutting elements disposed on the plurality of blades, the plurality of cutting elements comprising: at least two conical cutting elements comprising a substrate and a diamond layer having a conical cutting end, wherein at least one of the at least two conical cutting elements has a positive back rake angle, and at least one of the at least two conical cutting elements has a negative back rake angle.
Claims40
A downhole cutting tool, comprising:
- a tool body;
- a plurality of blades extending azimuthally from the tool body;
- and
- a plurality of cutting elements disposed on the plurality of blades, the plurality of cutting elements comprising:
- at least two conical cutting elements comprising a substrate and a diamond layer having a conical cutting end,
- wherein at least one of the at least two conical cutting elements has a positive back rake angle, and at least one of the at least two conical cutting elements has a negative back rake angle.
A downhole cutting tool, comprising:
- a tool body;
- a plurality of blades extending azimuthally from the tool body;
- and
- a plurality of cutting elements disposed on the plurality of blades, the plurality of cutting elements comprising:
- at least two conical cutting elements comprising a substrate and a diamond layer having a conical cutting end,
- wherein at least one of the at least two conical cutting elements has a positive side rake angle, and at least one of the at least conical cutting elements has a negative side rake angle.
A downhole cutting tool, comprising:
- a tool body;
- a plurality of blades extending azimuthally from the tool body;
- and
- a plurality of cutting elements disposed on the plurality of blades, the plurality of cutting elements comprising:
- at least one cutter having a substrate and a diamond table with a substantially planar cutting face;
- at least one conical cutting elements comprising a substrate and a diamond layer having a conical cutting end,
- wherein the at least one cutter and the at least one conical cutting element are disposed at the same radial distance from a bit centerline.
A drill bit for drilling a borehole in earth formations, comprising:
- a bit body having a bit axis and a bit face;
- a plurality of blades extending radially along the bit face;
- a plurality of cutting elements disposed on the plurality of blades, and
- a conical coring cutting element disposed in a region between at least two blades,
- wherein an apex of the conical coring cutting element is at a height H less than a cutting edge of the most radially interior cutting element, wherein H ranges up to 0.35 times a diameter of the bit.
A downhole cutting tool, comprising:
- a tool body;
- a plurality of blades extending azimuthally from the tool body;
- and
- a plurality of cutting elements disposed on the plurality of blades, the plurality of cutting elements comprising:
- at least one conical cutting elements comprising a substrate and a diamond layer having a conical cutting end,
- wherein a cutting profile of the plurality of cutting elements in a rotated view comprises at least one non-smooth step therein.
Dependencies are inferred from the claim text.