(19)

(11)

EP 2 004 953 A1

(12)

(43) Date of publication: 24.12.2008 Bulletin 2008/52 (21) Application number: 07727816.6 (22) Date of filing: 05.04.2007

(51) International Patent Classification (IPC):  E21B 43/00(2006.01) E21B 41/00(2006.01) G01F 15/08(2006.01) E21B 49/08(2006.01) G01F 1/74(2006.01) (86) International application number: PCT/EP2007/053348 (87) International publication number: WO 2007/116008 (18.10.2007 Gazette 2007/42)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 07.04.2006 EP 06112401 10.04.2006 EP 06112440 (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR The Hague (NL)	(72) Inventors: BRIERS, Jan Jozef Maria 2288 GS Rijswijk (NL) GOH, Keat-Choon 2288 GS Rijswijk (NL) MONCUR, Charles Edward 2288 GS Rijswijk (NL) OVERSCHEE, Peter 2288 GS Rijswijk (NL) (74) Representative: Zeestraten, Albertus W. J.  Shell International B.V. Intellectual Property Services P.O. Box 384 2501 CJ The Hague 2501 CJ The Hague (NL)