Drill Bits with Anti-Tracking Features
AssigneeBaker Hughes Incorporated
InventorsRobert J. Buske, John F. Bradford
Life of this patent
Estimating the term…
Abstract
Drill bits with at least two roller cones of different diameters and/or utilizing different cutter pitches in order to reduce bit tracking during drilling operations are described. In particular, earth boring drill bits are provided, the bits having two or more roller cones, and optionally one or more cutter blades, the bits being arranged for reducing tracking by the roller cone teeth during operation by adjusting the teeth spacing, cone pitch angle, and/or the diameter of one or more of the cones. These configurations enable anti-tracking behavior and enhanced drilling efficiency during bit operation.
Claims34
A drill bit comprising:
- a bit body having a longitudinal central axis;
- at least one blade extending from the bit body;
- a first and second arm extending from the bit body;
- a first roller cone rotatably secured to the first arm;
- a second roller cone rotatably secured to the second arm;
- and
- wherein the first roller cone is larger in diameter than the second roller cone.
A drill bit comprising:
- a bit body having a longitudinal central axis;
- at least one blade extending from the bit body;
- a first and second arm extending from the bit body;
- a first roller cone rotatably secured to the first arm and having a plurality of cutting elements arranged in generally circumferential rows thereon;
- and
- a second roller cone rotatably secured to the second arm and having a plurality of cutting elements arranged in generally circumferential rows thereon;
- wherein the first roller cone has a different cutter pitch than the second roller cone.
An earth-boring bit comprising:
- a bit body;
- at least two bit legs depending from the bit body and having a circumferentially extending outer surface, a leading side and a trailing side;
- a first cone and a second cone rotatably mounted on a cantilevered bearing shaft depending inwardly from the bit legs;
- and,
- a plurality of cutters arranged circumferentially about the outer surface of the cones,
- wherein the first cone and the second cone have different cone diameters.
Dependencies are inferred from the claim text.