Steel tooth cutter element with gage facing knee

Details Steel tooth cutter element with gage facing knee Steel tooth cutter element with gage facing knee

1997-04-04

1999-02-09

Schoeppel, Roger

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175431, 175428, 175374, E21B 1016

Patent

active

058682139

ABSTRACT:
A steel tooth, particularly suited for use in a rolling cone bit, includes a root region, a cutting tip spaced from the root region and a gage facing surface therebetween. The gage facing surface includes a knee, and is configured such that the cutting tip is maintained at a position off the gage curve. So positioned, the cutting tip is freed from having to perform any substantial cutting duty in the corner on the borehole corner, and instead may be configured and optimized for bottom hole cutting duty. The knee on the gage facing surface is configured and positioned so as to serve primarily to cut the borehole wall. It is preferred that the knee be positioned off gage, but that it be closer to the gage curve than the cutting tip.

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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).
Liang, D.B., M.K. Keshavan and S.D. McDonough, "The Development of Improved Soft Formation Milled Tooth Bits," Proceedings of the SPE/IADC Drilling Conference held Feb. 23-25, 1993, Amsterdam, pp. 605-614.

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