Force-balanced roller-cone bits, systems, drilling methods, and design methods

  • US 6,213,225 B1
  • Filed: 08/31/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 08/31/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A roller cone drill bit comprising:

  • a plurality of arms;

    rotatable cutting structures mounted on respective ones of said arms; and

    a plurality of teeth located on each of said cutting structures, wherein the number and locations of said teeth are not identical between ones of said rotatable cutting structures;

    wherein approximately the same axial force is acting on each of said cutting structure.

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