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 defining gage, shoulder, nose and cone regions comprising:
- a bit body having a longitudinal central axis;
- at least one blade extending from the bit body;
- a first arm extending from the bit body;
- a first roller cone rotatably secured to the first arm;
- a second arm extending from the bit body;
- a second roller cone rotatably secured to the second arm;
- wherein the first roller cone is larger in diameter than the second roller cone;
- and
- wherein each of the first roller cone and the second roller cone comprises a row of cutters substantially equally offset from the longitudinal central axis.
A drill bit comprising:
- gage, shoulder, nose and cone regions;
- at least one blade extending from the bit body;
- a first arm extending from the bit body;
- a first roller cone rotatably secured to the first arm and comprising a first row of cutters offset from the longitudinal central axis;
- a second arm extending from the bit body;
- a second roller cone rotatably secured to the second arm and comprising a second row of cutters substantially equally offset from the longitudinal central axis as the first row of cutters, wherein the first row of cutters and the second row of cutters have different cutter pitches;
- and
- wherein the first roller cone is larger in diameter than the second roller cone.
A drill bit defining gage, shoulder, nose, and cone regions comprising:
- a bit body having a longitudinal central axis;
- a first roller cone rotatably secured to the bit body and comprising a first row of cutters offset from the longitudinal central axis;
- a second roller cone rotatably secured to the bit body and comprising a second row of cutters substantially equally offset from the longitudinal central axis as the first row of cutters, wherein the first row of cutters and the second row of cutters have different cutter pitches;
- and
- wherein the first roller cone is larger in diameter than the second roller cone.
Dependencies are inferred from the claim text.