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Polycrystalline diamond chisel type insert for use in percussion drill bits even for use in large hole percussion drilling of oil wells

  • US 20180313162A1
  • Filed: 06/25/2018
  • Published: 11/01/2018
  • Est. Priority Date: 01/22/2008
  • Status: Active Grant
First Claim
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1. A rotary percussion drill bit, for drilling into ground, the drill bit formed having a body, the body capable of being secured with a drill shaft in preparation for a percussion drilling operation, the percussion drill bit including a series of inserts, said inserts being formed of a chisel, conical, or modified chisel insert designs;

  • the cutting face of each drill bit having an inner flat face and an outer beveled peripheral surface;

    a number of the polycrystalline diamond tipped chisel inserts having a first diameter inserted into the inner flat face and the outer beveled peripheral surface;

    a number of other polycrystalline diamond tipped chisel inserts having a second diameter inserted into the inner flat face, with the second diameter being different than the first diameter; and

    whereby said percussion drilling is performed at low thrust and torque, below 28 Bar.

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