METHOD OF FREEING STUCK DRILL PIPE - Patent 1454034

(19)

(11)

EP 1 454 034 A1

(12)

(43)	Date of publication:
	08.09.2004 Bulletin 2004/37

(21)	Application number: 02782409.3

(22)	Date of filing: 11.12.2002

(51)	International Patent Classification (IPC)⁷: E21B 31/00, E21B 7/24

(86)	International application number:
	PCT/US2002/039502

(87)	International publication number:
	WO 2003/050383 (19.06.2003 Gazette 2003/25)

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

(30)

Priority:

11.12.2001 US 339520 P

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

(72)	Inventors:
	HALE, Arthur, Herman Houston, TX 77074 (US) TUTUNCU, Azra, Nur Houston, TX 77024 (US)

(54)	METHOD OF FREEING STUCK DRILL PIPE