Impregnated rotary bit with high density monoblock center structure

摘要

A drill bit includes a bit body having an end face for engaging a rock formation. The end face is defined by a HIP pressed center structure formed of a metal matrix impregnated with super abrasive particles. The HIP pressed center structure includes a central region located at a center axis of said drill bit and finger regions extending radially from the central region. The end face is further defined by infiltrated ribs formed of a metal matrix impregnated with super abrasive particles. Certain ones of the infiltrated ribs are configured to form radial extensions from the finger regions of the HIP pressed center structure.

主权项

1. A drill bit, comprising:
an outer gage; a bit body having an end with a conical inner region and a shoulder disposed between the conical inner region and the outer gage; a cutting face attached to the end of the bit body and comprising:
a monoblock insert contained within the conical inner region, formed of a first metal matrix impregnated with super abrasive particles, and having a central region occupying a center of the cutting face and a plurality of finger regions extending from the central region;a plurality of ribs extending outwardly from the monoblock insert to the outer gage and formed of a second metal matrix impregnated with super abrasive particles; anda plurality of fluid channels formed between adjacent ribs, wherein:
the monoblock insert has a density and a hardness greater than a density and a hardness of the ribs, andsome of the ribs correspond to the finger portions such that each corresponding rib is aligned with and has an end located adjacent to the respective finger region.