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Roller-cone bits, systems, drilling methods, and design methods with optimization of tooth orientation

  • US 20030051918A1
  • Filed: 07/02/2002
  • Published: 03/20/2003
  • Est. Priority Date: 08/31/1998
  • Status: Abandoned Application
First Claim
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1. A method of designing a roller cone bit, comprising the steps of:

  • adjusting the orientation of at least one tooth on a cone, in dependence on an expected trajectory of said tooth through formation material at the cutting face, in dependence on an estimated ratio of cone rotation to bit rotation;

    recalculating said ratio, if the location of any row of teeth on said cone changes during optimization;

    recalculating the trajectory of said tooth in accordance with a recalculated value of said cone speed; and

    adjusting the orientation of said tooth again, in accordance with a recalculated value of said tooth trajectory.

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