(19)

(11)

EP 2 265 798 A2

(12)

(88) Date of publication A3: 21.10.2010 (43) Date of publication: 29.12.2010 Bulletin 2010/52 (21) Application number: 09732093.1 (22) Date of filing: 17.04.2009

(51) International Patent Classification (IPC):  E21B 43/24(2006.01) E21B 36/02(2006.01) (86) International application number: PCT/US2009/040936 (87) International publication number: WO 2009/129451 (22.10.2009 Gazette 2009/43)

(84) Designated Contracting States: 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 SE SI SK TR Designated Extension States: AL BA RS (30) Priority: 18.04.2008 US 46193 P (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR The Hague (NL)	(72) Inventors: WELLINGTON, Scott, Lee Bellaire TX 77401 (US) JOSHI, Mahendra, Ladharam Katy TX 77450 (US) CUI, Jingyu Katy TX 77450 (US) MILAM, Stanley, Nemec Houston TX 77055 (US) REYNOLDS, Michael, Anthony Katy TX 77450 (US)