(19)
(11) EP 1 500 782 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.04.2006 Bulletin 2006/15

(43) Date of publication A2:
26.01.2005 Bulletin 2005/04

(21) Application number: 04025561.4

(22) Date of filing: 31.08.1999
(51) International Patent Classification (IPC): 
E21B 10/16(2006.01)
E21B 10/08(2006.01)
(84) Designated Contracting States:
GB IT

(30) Priority: 31.08.1998 US 98442 P

(62) Application number of the earlier application in accordance with Art. 76 EPC:
03021139.5 / 1371811
99945376.4 / 1117894

(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 of designing a roller cone bit


(57) Disclosed herein is a method of designing a roller cone bit, comprising the steps of:

a) adjusting the orientation of at least one row of teeth on a cone, in dependence on an expected trajectory of said tooth through formation material at the cutting face;

b) calculating the width of uncut rings of formation material, in dependence on the orientation of said row of teeth, and adjusting the position of said row of teeth in dependence on said calculated width; and

c) recalculating the rotational speed of said cone, if the position of said row is changed, and accordingly recalculating said trajectory of teeth in said row.









Search report