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

  • US 6,873,947 B1
  • Filed: 08/09/2000
  • Issued: 03/29/2005
  • Est. Priority Date: 03/13/2000
  • Status: Expired due to Term
First Claim
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1. A method for designing a roller bit cone, comprising:

  • simulating the drill bit drilling through an earth formation, the simulating comprising;

    determining, based on a means for determining an axial force, an axial force acting on each of the cutting elements, determining the axial force acting on each of the roller cones, based on the axial force acting on the cutting elements, rotating the bit and redetermining the axial forces acting on each of the cutting elements, repeating the rotating and redetermining for a number of rotations, and adjusting at least one bit design parameter, and repeating the simulating and adjusting until a difference between the axial force on each one of the roller cones is less than a difference between the axial force determined prior to adjusting the at least one initial design parameter.

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