(19)

(11)

EP 2 739 820 A2

(12)

(88) Date of publication A3: 04.07.2013 (43) Date of publication: 11.06.2014 Bulletin 2014/24 (21) Application number: 12740962.1 (22) Date of filing: 26.07.2012

(51) International Patent Classification (IPC):  E21B 43/26(2006.01) (86) International application number: PCT/EP2012/064720 (87) International publication number: WO 2013/017529 (07.02.2013 Gazette 2013/06)

(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: 04.08.2011 US 201161515058 P (71) Applicant: Total S.A. 92400 Courbevoie (FR)	(72) Inventor: LEON, Jean-François F-33110 LE BOUSCAT (FR) (74) Representative: Cabinet Plasseraud  52, rue de la Victoire 75440 Paris Cedex 09 75440 Paris Cedex 09 (FR)