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

(19)

(11)

EP 1 498 572 A3

(12)	EUROPEAN PATENT APPLICATION

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

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

(21)	Application number: 04025232.2

(22)	Date of filing: 31.08.1999

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International Patent Classification (IPC):

E21B 10/16^(2006.01)

E21B 10/08^(2006.01)

(84)	Designated Contracting States:
	GB IT

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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, Texas 75248 (US)

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

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

(57) Disclosed herein is a method for optimising drilling performance of a roller cone drill bit, comprising simulating drilling with the bit in a selected earth formation to determine at least one drilling performance parameter, adjusting, an orientation of at least one non-axisymmetric cutting element on the bit, repeating the simulating the drilling and determining the at least one performance parameter, and repeating the adjusting and simulating the drilling until the at least one performance parameter is determined to be at an optimum value.

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