(19)

(11)

EP 2 630 299 A1

(12)

(43) Date of publication: 28.08.2013 Bulletin 2013/35 (21) Application number: 11775895.3 (22) Date of filing: 21.10.2011

(51) International Patent Classification (IPC):  E02B 17/00(2006.01) E02B 1/00(2006.01) E02B 17/02(2006.01) E21B 19/00(2006.01) (86) International application number: PCT/US2011/057200 (87) International publication number: WO 2012/054793 (26.04.2012 Gazette 2012/17)

(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: 20.10.2011 US 201113277791 21.10.2010 US 405497 P (71) Applicant: ConocoPhillips Company Houston, Texas 77079 (US)	(72) Inventors: NOBLE, Peter G. Spring Texas 77379 (US) SHAFER, Randall S. Houston Texas 77007 (US) BERTA, Dominique P. Katy Texas 77450 (US) (74) Representative: Simpson, Paul Christopher  ConocoPhillips (U.K.) Limited Legal Floor 6, Portman House 2 Portman Street London Greater London W1H 6DU London Greater London W1H 6DU (GB)