Drill bit with offset counter-rotating cutters
AssigneeHalliburton Energy Services, Inc.
InventorDouglas Bruce Caraway
Life of this patent
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Abstract
A drill bit is provided. The drill bit includes a bit body and an axle disposed in the bit body. The axle includes a first axle portion extending in a longitudinal direction and a second axle portion extending in the longitudinal direction. A longitudinal end of the first axle portion is continuous with a longitudinal end of the second axle portion. When viewed from the longitudinal direction, the first axle portion and the second axle portion are not coaxial, and an outer perimeter of the first axle portion is located entirely within an outer perimeter of the second axle portion. The drill bit also includes a first cutter disposed on the first axle portion and a second cutter disposed on the second axle portion.
Claims20
A drill bit, comprising:
- a bit body;
- an axle disposed in the bit body, the axle comprising:
- a first axle portion extending in a longitudinal direction;
- and
- a second axle portion extending in the longitudinal direction, wherein a longitudinal end of the first axle portion is continuous with a longitudinal end of the second axle portion;
- wherein, when viewed from the longitudinal direction:
- the first axle portion and the second axle portion are not coaxial, and
- an outer perimeter of the first axle portion is located entirely within an outer perimeter of the second axle portion;
- a first cutter disposed on the first axle portion;
- and
- a second cutter disposed on the second axle portion.
A method of drilling a wellbore, comprising:
- lowering a drill bit into a subterranean formation, the drill bit comprising:
- a bit body;
- an axle disposed in the bit body, the axle comprising:
- a first axle portion extending in a longitudinal direction;
- and
- a second axle portion extending in the longitudinal direction, wherein a longitudinal end of the first axle portion is continuous with a longitudinal end of the second axle portion;
- wherein, when viewed from the longitudinal direction:
- the first axle portion and the second axle portion are not coaxial, and
- an outer perimeter of the first axle portion is located entirely within an outer perimeter of the second axle portion;
- and
- two cutters disposed one on each of the first axle portion and the second axle portion;
- and
- forming the wellbore by cutting through the subterranean formation at least partially via the two cutters.
A cutter assembly for use in a drill bit, the cutter assembly comprising:
- an axle configured to be disposed in a bit body of the drill bit, the axle comprising:
- a first axle portion extending in a longitudinal direction;
- and
- a second axle portion extending in the longitudinal direction, wherein a longitudinal end of the first axle portion is continuous with a longitudinal end of the second axle portion;
- wherein, when viewed from the longitudinal direction:
- the first axle portion and the second axle portion are not coaxial, and
- an outer perimeter of the first axle portion is located entirely within an outer perimeter of the second axle portion;
- and
- two cutters configured to be disposed one on each of the first axle portion and the second axle portion.
Dependencies are inferred from the claim text.