consist of fixed cutter blades that are integral with the body of the bit and rotate as a unit with the drillstring. The cutting element consists of steelcutters, diamond, or polycrystalline diamond compact (PDC). • Steelcutter bits the serrated steel blades are set at different angles(e.g. a fishtail bit). • Natural diamond bits the face or crown of the bit consists of many diamonds set in a tungsten carbide matrix. • Polycrystalline diamond compact (PDC) bits a layer of synthetic PDC is bonded to a cemented tungsten carbide, it contains many diamond crystals bonded together. The sintered PDC compact is bonded either to a tungsten carbide bit-body matrix or to a tungsten carbide stud that is mounted in a steel bit. • Thermally stable polycrystalline (TSP) bits these bits are manufactured in a similar fashion to PDC bits but are tolerant of much higher temperatures than PDC bits.
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