HYBRID ROTARY CONE DRILL BIT

摘要

A hybrid rotary cone drill bit includes a plurality of legs. A bearing shaft extends from each leg, and a rotary cone is rotationally coupled to each bearing shaft. At least one rotary cone includes a nose row of cutting structures, an inner row of cutting structures, and a gage row of cutting structures. The nose row and the inner row of cutting structures are formed of milled teeth. The gage row of cutting structures is formed of cutter inserts.

主权项

1. A rotary cone drill bit, comprising:
a plurality of legs; a bearing shaft extending from each leg; a plurality of rotary cones, each rotary cone rotationally coupled to a respective bearing shaft; at least one rotary cone of the plurality of rotary cones defining a generally conical surface and having a nose row of cutting structures extending from the generally conical surface, an inner row of cutting structures extending from the generally conical surface, and a gage row of cutting structures extending from the generally conical surface; the nose row and the inner row of cutting structures comprising milled teeth; and the gage row of cutting structures comprising cutter inserts.