E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/46 (2006.01) E21B 10/56 (2006.01)
Patent
CA 2327560
A cutter element for use in a drill bit, comprising a substrate and a cutting layer. The substrate comprises a grip portion and an extension portion, where the grip portion has an insert axis and the extension portion including an interface surface having an first apex. The cutting layer is affixed to the interface surface and has a cutting surface having a second apex. The cutting layer is shaped such that when a plane passing through the first apex and lying parallel to the insert axis and normal to a radius from the insert axis the first apex is defined, the plane divides the cutting layer into major and minor portions and the major portion has a major volume that is at least 50 percent of the total volume of said cutting layer. Alternative embodiments of the present invention include variations wherein the first and second apices do not coincide and wherein the interface surface of the substrate is not axisymmetric. Using these variations, cutter elements having sizeable variations in thickness are constructed.
Anderson Nathan R.
Belnap J. Daniel
Cawthorne Chris E.
Eyre Ronald K.
Huang Sujian J.
Ridout & Maybee Llp
Smith International Inc.
LandOfFree
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