(19)

(11)

EP 2 271 823 A2

(12)

(88) Date of publication A3: 04.11.2010 (43) Date of publication: 12.01.2011 Bulletin 2011/02 (21) Application number: 09733435.3 (22) Date of filing: 17.04.2009

(51) International Patent Classification (IPC):  E21B 43/243(2006.01) (86) International application number: PCT/US2009/040925 (87) International publication number: WO 2009/129444 (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 46155 P (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR The Hague (NL)	(72) Inventors: REYNOLDS, Michael Anthony Katy TX 77450 (US) CUI, Jingyu Katy TX 77450 (US) WELLINGTON, Scott Lee Bellaire TX 77401 (US) JOSHI, Mahendra Ladharam Katy TX 77450 (US) MILAM, Stanley Nemec Houston TX 77055 (US)