METHOD OF DRILLING A WELLBORE WITH DISENGAGABLE COUPLERS - Patent 1220974

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EP 1 220 974 A1

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(43)	Date of publication:
	10.07.2002 Bulletin 2002/28

(21)	Application number: 00972768.6

(22)	Date of filing: 13.10.2000

(51)	International Patent Classification (IPC)⁷: E21B 47/09, E21B 17/05, E21B 17/06

(86)	International application number:
	PCT/EP0010/150

(87)	International publication number:
	WO 0129/373 (26.04.2001 Gazette 2001/17)

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

15.10.1999 EP 99203404

(71)	Applicant: SHELL INTERNATIONALE RESEARCHMAATSCHAPPIJ B.V.
	2596 HR Den Haag (NL)

(72)	Inventor:
	BEST, Bruno NL-2288 GD Rijswijk (NL)

(54)	METHOD OF DRILLING A WELLBORE WITH DISENGAGABLE COUPLERS