(19)

(11)

EP 2 825 728 A2

(12)

(88) Date of publication A3: 03.07.2014 (43) Date of publication: 21.01.2015 Bulletin 2015/04 (21) Application number: 13712466.5 (22) Date of filing: 14.03.2013

(51) International Patent Classification (IPC):  E21B 47/10(2012.01) (86) International application number: PCT/US2013/031491 (87) International publication number: WO 2013/138622 (19.09.2013 Gazette 2013/38)

(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 Designated Extension States: BA ME (30) Priority: 15.03.2012 US 201261611495 P (71) Applicant: Chevron U.S.A. Inc. San Ramon, CA 94583 (US)	(72) Inventors: HUNT, Daniel Francis Alan San Ramon, California 94583 (US) BIANCO, Luis Carlos Baralho San Ramon, California 94583 (US) ANDRESEN, Christian André Houston, Texas 77060 (US) SKALMERAS, Jomar Houston, Texas 77060 (US) (74) Representative: Nash, David Allan  Haseltine Lake LLP Redcliff Quay 120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB)