METHOD OF DETERMINING AZIMUTH OF A BOREHOLE

(19)

(11)

EP 1 088 152 A1

(12)

(43)	Date of publication:
	04.04.2001 Bulletin 2001/14

(21)	Application number: 99927912.8

(22)	Date of filing: 14.06.1999

(51)	International Patent Classification (IPC)⁷: E21B 47/022

(86)	International application number:
	PCT/EP9903/940

(87)	International publication number:
	WO 9966/173 (23.12.1999 Gazette 1999/51)

(84)	Designated Contracting States:
	DE DK ES FR GB NL

(30)

Priority:

18.06.1998 EP 98304821

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

(72)	Inventor:
	HARTMANN, Robin, Adrianus NL-2288 GD Rijswijk (NL)

(54)	METHOD OF DETERMINING AZIMUTH OF A BOREHOLE