Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1991-07-30
1992-07-21
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175378, 175406, 175429, E21B 1016, E21B 1050
Patent
active
051314800
ABSTRACT:
A milled tooth rotary cone rock bit, as it is operated in a borehole, subjects the heel of each cone into contact with the borehole wall when the gage row milled teeth wear. The heel row of each cone is relieved and tungsten carbide chisel inserts are equidistantly placed within the relieved heel row. The heel row inserts cooperate with the gage row milled teeth and progressively cut more of the gage of the borehole as the row of milled teeth on the gage of the cone wear. Moreover, the gage row milled teeth are partially hardfaced leaving relieved areas on the cutting side of each tooth to enhance the cutting action of the gage row of each cone.
REFERENCES:
patent: 2774571 (1956-12-01), Morlan
patent: 3134447 (1964-05-01), McElya et al.
patent: 3137355 (1964-06-01), Schmacher, Jr.
patent: 3389761 (1968-06-01), Ott
patent: 3452831 (1969-07-01), Beyer
patent: 4726432 (1988-02-01), Scott et al.
patent: 4832139 (1989-05-01), Minikus et al.
patent: 4836307 (1989-06-01), Keshavan et al.
Reed, "A Revolutionary New Bit by Reed . . . the Reed Blunt", World Oil, Mar., 1963, p. 159.
Lockstedt Alan W.
Nguyen Quan V.
Dang Hoang C.
Smith International Inc.
Upton Robert G.
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