ROLLER-CONE BITS, SYSTEMS, DRILLING METHODS, AND DESIGN METHODS WITH OPTIMIZATION OF TOOTH ORIENTATION - Patent 1117894

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EP 1 117 894 A2

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(88)	Date of publication A3:
	08.06.2000

(43)	Date of publication:
	25.07.2001 Bulletin 2001/30

(21)	Application number: 99945376.4

(22)	Date of filing: 31.08.1999

(51)	International Patent Classification (IPC)⁷: E21B 10/16

(86)	International application number:
	PCT/US9919/992

(87)	International publication number:
	WO 0012/860 (09.03.2000 Gazette 2000/10)

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

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Priority:

31.08.1998 US 98442 P

(71)	Applicant: Halliburton Energy Services, Inc.
	Carrollton, TX 75006 (US)

(72)	Inventor:
	CHEN, Shilin Dallas, TX 75248 (US)

(74)	Representative: Lawrence, John
	Barker Brettell 138 Hagley RoadEdgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)

(54)	ROLLER-CONE BITS, SYSTEMS, DRILLING METHODS, AND DESIGN METHODS WITH OPTIMIZATION OF TOOTH ORIENTATION