Cutter having shaped working surface with varying edge chamfer
AssigneeSmith International, Inc.
InventorsYuelin Shen, Youhe Zhang, Steffen S. Kristiansen
Life of this patent
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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.
Claims9
A cutter for an earth boring 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, and
- a chamfer along at least a portion of the arcuate cutting edge between said working surface and said side surface, the chamfer having a varied geometry, wherein the varied geometry of the chamfer comprises at least one of a varied angle of the chamfer and a varied width of the chamfer.
Dependencies are inferred from the claim text.