Fixed cutter bit for directional drilling applications
AssigneeSmith International, Inc.
InventorMichael G Azar
Life of this patent
Estimating the term…
Abstract
A drill bit for drilling a borehole in earthen formations, the bit comprising: a bit body having a bit axis and a bit face including a cone region, a shoulder region, and a gage region; a first primary blade extending radially along the bit face from the cone region to the gage region; a plurality of cutter elements mounted to the first primary blade, wherein a first of the plurality of cutter elements has a planar cutting face and a second of the plurality of cutter elements has a convex cutting face; and wherein each cutting face is forward-facing.
Claims26
A drill bit for drilling a borehole in earthen formations, the bit comprising:
- a bit body having a bit axis and a bit face including a cone region, a shoulder region, and a gage region;
- a first primary blade extending radially along the bit face from the cone region to the gage region;
- a plurality of cutter elements mounted to the first primary blade, wherein a first of the plurality of cutter elements has a planar cutting face and a second of the plurality of cutter elements has a convex cutting face;
- and
- wherein each cutting face of the first and the second of the plurality of cutter elements has a longitudinal axis that is forward facing relative to a direction of rotation of the drill bit,
- wherein the first of the plurality and the second of the plurality of cutter elements are primary cutter elements.
A drill bit for drilling a borehole in earthen formations, the bit comprising:
- a bit body having a bit axis and a bit face including a cone region, a shoulder region, and a gage region;
- a first primary blade extending radially along the bit face from the cone region to the gage region;
- a plurality of cutter elements mounted to the first primary blade, wherein a first of the plurality of cutter elements has a planar cutting face and a second of the plurality of cutter elements has a convex cutting face;
- and
- wherein each cutting face of the first and the second of the plurality of cutter elements has a longitudinal axis that is forward facing relative to a direction of rotation of the drill bit,
- wherein the first of the plurality of cutter elements is a primary cutter element and the second of the plurality of cutter elements is a backup cutter element.
A drill bit for drilling a borehole in earthen formations, the bit comprising:
- a bit body having a bit axis and a bit face including a cone region, a shoulder region, and a gage region;
- a plurality of primary blades, each primary blade extending radially along the bit face from the cone region to the gage region;
- a plurality of secondary blades, each secondary blade extending radially along the bit face from the shoulder region to the gage region;
- a plurality of a first type of cutter element mounted to each primary blade and each secondary blade, each of the first type of cutter elements has a planar cutting face;
- a plurality of a second type of cutter element mounted to each primary blade, each of the second type of cutter elements has a convex cutting face;
- and
- wherein each cutting face of the first and the second of the plurality of cutter elements has a longitudinal axis that is forward facing relative to a direction of rotation of the drill bit.
Dependencies are inferred from the claim text.