(19)

(11)

EP 2 513 418 A1

(12)

(43) Date of publication: 24.10.2012 Bulletin 2012/43 (21) Application number: 10842544.8 (22) Date of filing: 15.12.2010

(51) International Patent Classification (IPC):  E21B 43/20(2006.01) F17D 3/00(2006.01) (86) International application number: PCT/US2010/060541 (87) International publication number: WO 2011/084497 (14.07.2011 Gazette 2011/28)

(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: 15.12.2009 US 286520 P (71) Applicant: Chevron U.S.A. Inc. San Ramon, CA 94583 (US)	(72) Inventors: LOONEY, Mark D. Houston Texas 77090 (US) LESTZ, Robert S. Missouri City Texas 77459 (US) CASSIDY, Stephen David Bakersfield California 93311 (US) (74) Representative: Nash, David Allan  Haseltine Lake LLP Redcliff Quay 120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB)