Multi-lobed cutter element for drill bit

Details Multi-lobed cutter element for drill bit Multi-lobed cutter element for drill bit

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/16 (2006.01) E21B 10/52 (2006.01)

Patent

CA 2456501

Disclosed are cutter elements for a drill bits having particular, but not exclusive, application on the nose portion of the cone cutters of a rolling cone bit. The cutter elements include a base, a cutting portion, and a plurality of cutting lobes extending radially from the cutting portion. Each lobe includes a forward-facing cutting face and trailing portion having a trailing surface that intersects the cutting face in a nonlinear cutting edge. The trailing surface is non-planar and recedes away from the cutting edge. In certain embodiments, the trailing surface is a partial dome shaped surface. The trailing portion provides strength and buttresses the cutting edge. A drill bit employing such cutter elements in the nose region of its rolling cones, either as a single element or in a circumferential row of such cutters, will aggressively attack the core regions of the borehole bottom.

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