(19)

(11)

EP 2 655 782 A1

(12)

(43) Date of publication: 30.10.2013 Bulletin 2013/44 (21) Application number: 11799098.6 (22) Date of filing: 20.12.2011

(51) International Patent Classification (IPC):  E21B 7/06(2006.01) E21B 7/18(2006.01) (86) International application number: PCT/EP2011/073386 (87) International publication number: WO 2012/084934 (28.06.2012 Gazette 2012/26)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 22.12.2010 EP 10196484 (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR Den Haag (NL)	(72) Inventors: BLANGE, Jan-Jette NL-2288 GS Rijswijk (NL) VAN NIEUWKOOP, Pieter NL-2288 GS Rijswijk (NL) MARWEDE, Jochen NL-2288 GS Rijswijk (NL) (74) Representative: Matthezing, Robert Maarten et al Shell International B.V. LSI PO Box 384 2501 CJ The Hague 2501 CJ The Hague (NL)