(19)
(11) EP 1 498 573 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.05.2006 Bulletin 2006/21

(43) Date of publication A2:
19.01.2005 Bulletin 2005/03

(21) Application number: 04025233.0

(22) Date of filing: 31.08.1999
(51) International Patent Classification (IPC): 
E21B 10/16(2006.01)
E21B 41/00(2006.01)
(84) Designated Contracting States:
GB IT

(30) Priority: 31.08.1998 US 98466 P

(62) Application number of the earlier application in accordance with Art. 76 EPC:
03021140.3 / 1389666
99945375.6 / 1112433

(71) Applicant: HALLIBURTON ENERGY SERVICES, INC.
Carrollton, TX 75006 (US)

(72) Inventor:
  • Chen, Shilin
    Dallas, TX 75248 (US)

(74) Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Method for designing a roller-cone bit


(57) Disclosed herein is a method for designing a roller cone drill bit, comprising simulating the bit drilling through an earth formation wherein the simulating comprises determining an axial force on a cutting element, based on a means for determining an axial force, determining an axial force on the roller cones, based on the axial forces on the cutting elements, and angularly rotating the bit; adjusting at least one design parameter of the bit; repeating the simulating the bit drilling; and comparing a distribution of axial forces among the roller cones prior to the adjusting the at least one design parameter with a distribution of axial forces among the roller cones after adjusting the at least one design parameter.





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