Cutter having shaped working surface with varying edge chamfer
AssigneeSmith International, Inc.
InventorsYuelin Shen, Youhe Zhang, Steffen S. Kristiansen
Life of this patent
Estimating the term…
Abstract
A cutter for a drill bit used for drilling wells in a geological formation includes an ultra hard working surface and a chamfer along an edge of the working surface, wherein the chamfer has a varied geometry along the edge. The average geometry of the chamfer varies with cutting depth. A depression in the shaped working surface is oriented with the varied chamfer and facilitates forming the varied chamfer. A non-planar interface has depressions oriented with depressions in the shaped working surface to provide support to loads on the working surface of the cutter when used.
Claims45
A cutter for an earth boring drag bit, said bit comprising a bit body including a portion for connecting with a drill string, the cutter comprising:
- a substrate mountable on one of a plurality of blades extending from said bit body;
- and
- an ultra hard material layer over said substrate, said ultra hard material layer comprising,
- a working surface,
- a side surface adjacent the working surface and generally parallel to a cutter axis,
- an arcuate cutting edge formed between the working surface and the side surface, said arcuate cutting edge being a peripheral edge of said working surface extending around an entire a periphery of said working surfaces, and
- a chamfer along the entire arcuate cutting edge between said working surface and said side surface, the chamfer having a varied geometry.
A cutter for an earth boring drag bit comprising a bit body including portion for connecting with a drill string, the cutter comprising:
- a support body mountable on one of a plurality of blades extending from said bit body, said support body having an axial orientation;
- and
- an ultra hard material over the support body, the ultra hard material comprising,
- a working surface secured to the support body at an interface, the working surface having a plurality of depressions oriented at oblique angles relative to the axial orientation of the support body, and
- a chamfered edge with a varied width chamfer between the plurality of depressions.
A cutter for an earth boring drag bit comprising a portion for connecting with a drill string, the cutter comprising:
- a support body having an axial orientation and defining a non-planar interface support surface;
- and
- a polycrystalline diamond material bonded to the non-planar interface support surface and defining a working surface spaced apart from the non-planar interface, wherein the working surface comprises an arcuate cutting edge, a chamfer extending from said arcuate cutting edge and at least one depression at an obtuse angle to the axial orientation of the support body extending to said arcuate cutting edge, and wherein the non-planar interface comprises a portion of the support surface generally aligned with the depression and at an obtuse angle relative to the axial orientation, wherein said chamfer has a variable geometry.
An earth boring drag bit comprising:
- a drag bit body comprising a portion for connecting with a drill string;
- a plurality of blades extending from said bit body;
- and
- at least one cutter held by at least one of said blades, the at least one cutter having an ultra hard working surface, the working surface including an arcuate cutting edge, said arcuate cutting edge being a peripheral edge of said working surface extending around an entire periphery of said working surface, and a chamfer with a varied geometry along the cutting edge, the chamfer extending around the entire periphery of the working surface.
An earth boring drag bit comprising:
- a drag bit body;
- a plurality of blades formed on the bit body;
- and
- a plurality of cutters held by at least one of the blades, at least one of the plurality of cutters having an ultra hard material having a shaped working surface with an arcuate cutting edge, said arcuate cutting edge being a peripheral edge of said working surface extending around an entire periphery of said working surface, a side surface adjacent the cutting edge disposed generally parallel to a cutter axis, and a varied geometry chamfer along said entire periphery between the working surface and the side surface.
A polycrystalline diamond compact for an earth boring drag bit comprising a body including portion for connecting with a drill string, the compact comprising:
- a substrate mountable on one of a plurality of blades extending from said bit body;
- a polycrystalline diamond working surface over said substrate, said working surface having an arcuate cutting edge;
- a side surface adjacent the arcuate cutting edge and generally parallel to a cutter axis;
- and
- a chamfer along the arcuate cutting edge between the working surface and the side surface, the chamfer having a first chamfer portion defining a first width and first angle configuration and a second chamfer portion defining a second width and second angle configuration, wherein at least one of the width and angle configuration of the first chamfer portion and the second chamfer portion are different.
A cutter for an earth boring drag bit comprising a body including a portion for connecting with a drill string, the cutter comprising:
- a substrate mountable on one of a plurality of blades extending from said bit body;
- and
- an ultra hard material layer bonded to said substrate, the ultra hard material layer comprising,
- a working surface with an arcuate cutting edge, and
- a chamfer along the arcuate cutting edge, the chamfer having a varied geometry and extending around the entire periphery of the working surface.
A cutter for an earth boring drag bit comprising a body including a portion for connecting with a drill string, the cutter comprising:
- a substrate mountable on one of a plurality of blades extending from said bit body;
- and
- an ultra hard material layer bonded to said substrate, the ultra hard material layer comprising,
- a working surface with an arcuate cutting edge, and
- a chamfer along the cutting edge, the chamfer having a varied geometry;
- wherein the varied geometry of the chamfer comprises at least one selected from a varied angle of the chamfer and a varied width of the chamfer, and the varied geometry of the chamfer increases in magnitude in a direction away from a point of maximum contact in a critical region.
An earth boring drag bit comprising:
- a drag bit body;
- a plurality of blades formed on the bit body;
- and
- a plurality of cutters held by at least one of said blades, at least one of the plurality of cutters having an ultra hard working surface with an arcuate cutting edge, said arcuate cutting edge being a peripheral edge of said working surface extending around at least a portion of a periphery of said working surface, and a varied geometry chamfer along at least a portion of the cutting edge, wherein the varied geometry of the chamfer comprises at least one selected from a varied angle of the chamfer and a varied width of the chamfer, and wherein the varied geometry of the chamfer increases in magnitude in a direction away from a point of maximum contact in a critical region.
Dependencies are inferred from the claim text.