Drill bits utilizing polycrystalline diamond grit.

摘要

The present invention provides impregnated and surface set rotary drill bits wherein the cutting elements are thermally stable, mesh size polycrystalline diamond abrasive grit of from about 1 micron to about 2000 microns. Such drill bits can be used to drill a broader range of geological formations than could be drilled with prior art single crystal of polycrystalline diamond compact containing drill bits.