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Cutter geometry for high ROP applications

  • US 8,783,387 B2
  • Filed: 09/05/2008
  • Issued: 07/22/2014
  • Est. Priority Date: 09/05/2008
  • Status: Active Grant
First Claim
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1. A polycrystalline diamond compact (“

  • PDC”

    ) cutter comprising;

    a cylindrical body formed from a substrate material;

    an ultrahard layer disposed on the cylindrical body; and

    a cutting face perpendicular to a longitudinal axis of the cylindrical body, the cutting face including three lobes that form a planar surface that is perpendicular to the longitudinal axis of the cylindrical body, the three lobes defined by three substantially concave portions and three convex portions with respect to the longitudinal axis of the cylindrical body,wherein the radius of at least one lobe is between 50 and 90 percent of the radius of the cylindrical body,wherein the ultrahard layer comprises a transition section having a non-circular cross -section, the transition section extending from a circular cross-section of the cylindrical body to a non-circular cross-section of the cutting face, wherein the transition section comprises a smooth profile along the axial length and along a perimeter of the transition section from the circular cross-section of the cylindrical body to the non-circular cross-section of the cutting face, and wherein the cross-sectional area of the transition section decreases with axial distance from the interface along a majority of the axial length of the transition section.

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