Method for simulating drilling of roller cone bits and its application to roller cone bit design and performance

  • US 6,516,293 B1
  • Filed: 03/13/2000
  • Issued: 02/04/2003
  • Est. Priority Date: 03/13/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for generating a visual representation of a roller cone bit drilling in earth formations, comprising:

  • selecting bit design parameters, comprising at least a geometry of a cutting element on said bit;

    selecting drilling parameters, comprising at least an axial force on said bit;

    selecting an earth formation to be represented as drilled;

    calculating from said selected drilling parameters, said selected bit design parameters and said earth formation, parameters for a crater formed when one of a plurality of said cutting elements contacts said earth formation;

    calculating a bottomhole geometry, wherein said crater is removed from a bottomhole surface;

    simulating incrementally rotating said bit, and repeating said calculating of said crater parameters and said bottomhole geometry based on calculated roller cone rotation speed and geometrical location with respect to rotation of said roller cone drill bit about its axis; and

    converting said crater parameters and said bottomhole geometry parameters into said visual representation.

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