Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1992-02-04
1994-02-01
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175430, 175431, 175432, 175393, 761084, E21B 1046, E21B 1060
Patent
active
052825132
ABSTRACT:
A diamond drag type drill bit for drilling in an earthen formation consists of a body forming a first cutting end formed from a matrix material and a second open threaded pin end. The first cutting end consists of a multiplicity of substantially radially disposed ridges and flow channels formed by the matrix material. The flow channels intersect a fluid discharge port and radially extend outwardly toward a peripheral edge formed by the cutter end. The ridges contain, along their apical, radially extended edges, a multiplicity of essentially equidistantly spaced diamond cutters having each of their cutting edges formed therein aligned substantially along the apical edge. The space between each diamond cutter contains a metallic filler material aligned along the apical edge that is less hard than either the diamond or the supporting matrix material forming the first cutting end of the drag bit. The filler material wears away rapidly during operation of the bit in the earthen formation allowing the diamond cutters to protrude an extent necessary to obtain optimum formation cutting rates.
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Novosad Stephen J.
Smith International Inc.
Upton Robert G.
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