Drill bit with cutter element having multifaceted, slanted top cutting surface
AssigneeSmith International, Inc.
InventorBrandon Moss
Life of this patent
Estimating the term…
Abstract
A drill bit includes a cutter element having a tapered and faceted side surface extending to a peak, and a polygonal wear face that slopes from the peak toward the cutter element base. The cutter element is mounted in a cone cutter of a rolling cone drill bit and, in certain embodiments, is positioned such that, when the cutter element is in a position farthest from the bit axis, the wear face generally faces and is parallel to the borehole sidewall and the peak engages the borehole bottom.
Claims40
A rolling cone drill bit for drilling a borehole having a gage diameter and a borehole bottom and a borehole sidewall, the bit comprising:
- a bit body having a bit axis;
- at least one rolling cone cutter mounted on the bit body for rotation about a cone axis and having a first surface for cuffing the borehole bottom and second surface for cutting the borehole sidewall;
- a plurality of cutter elements secured to said cone cutter;
- at least a first of said cutter elements comprising a base portion retained in said cone cutter, and a cutting portion extending in a first direction from said base portion to a peak;
- wherein said cutting portion comprises a generally planar surface having a generally polygonal shape and sloping from said peak toward said base;
- wherein said generally polygonal shape includes a first corner adjacent the peak, a first side extending from the first corner towards the base, and a second side extending from the first corner towards the base, wherein the second side diverges from the first side as it extends towards the base;
- wherein said cuffing portion further comprising a side surface having three or more facets extending between said base and said generally planar surface.
A rolling cone drill bit for drilling in earthen formations and forming a borehole having a borehole sidewall, a borehole bottom, and a borehole corner, the bit comprising:
- a bit body disposed about a bit axis;
- at least one rolling cone cutter mounted on said bit body for rotation about a cone axis;
- a plurality of cutter elements secured to said cone cutter and positioned to cut the corner of the borehole;
- said cutter elements comprising a base portion mounted in said cone cutter and a cutting portion extending from said base portion, said cutting portion comprising a peak and a cutting surface having a slanted and generally planar wear face;
- and
- said cutting surface further comprising a side surface extending from said base to said wear face, said side surface including three or more facets and intersecting said wear face in an edge forming a generally triangular-shaped perimeter of said wear face having a first corner adjacent the peak, a second corner distal the peak, and a third corner distal the peak.
A cutter element for use in a rolling cone drill bit, comprising:
- a base portion and a cutting portion extending in a first direction from said base portion to a peak, said cutting portion comprising a generally planar surface having a generally polygonal shape and sloping from said peak toward said base;
- wherein said generally polygonal shape includes a first corner adjacent the peak, a first side extending from the first corner towards the base, and a second side extending from the first corner towards the base, wherein the second side diverges from the first side as it extends towards the base;
- and
- wherein said cutting portion further comprising a side surface having three or more facets extending from said base to said generally planar surface.
A cutter element for a drill bit comprising:
- a base portion;
- a cutting portion extending from said base portion and comprising a peak and a cutting surface having a slanted and generally planar top surface;
- said cutting surface further comprising a side surface extending between said base and said top surface, wherein said side surface includes three or more facets and intersects said top surface in an edge forming a triangular-shaped perimeter of said top surface having a first corner adjacent the peak, a second corner distal the peak, and a third corner distal the peak;
- and
- wherein each of said corners of said triangular shape are rounded corners, and wherein at least one of said corners differs in radius from a second of said corners.
Dependencies are inferred from the claim text.