Cutter element adapted to withstand tensile stress

Details Cutter element adapted to withstand tensile stress Cutter element adapted to withstand tensile stress

1997-04-04

1999-06-29

Tsay, Frank S.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175432, E21B 1008

Patent

active

059154861

ABSTRACT:
A cutter element having a substantially flat wear face and leading compression and trailing tension zones, wherein the leading compression zone is sharper than the trailing tension zone. Sharpness is defined as either a smaller inside angle at the intersection of a pair of planes or as a smaller radius of curvature. The cutter element of the present invention experiences reduced stress on its trailing portion in the direction of cutting movement and therefore is less subject to extreme impact damage and cyclic fatigue. The present invention can be applied with particular advantage to heel row cutters, but can also be applied to cutters in other rows that primarily ream the borehole wall and cooperatively cut the borehole corner. The present cutter element can be constructed so as to have either a positive or negative rake angle at its leading compression zone, or to have any of a variety of shapes, depending on the characteristics of the formation in which it is to be used.

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Smith International, Inc. internal documents; Exhibit A comprises drawings of certain cutter inserts that were included on drill bits sold before Apr. 4, 1997; Exhibit B includes a drawing of a cutter insert that was included on drill bits sold before Apr. 4, 1997; (See accompanying IDS).

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