(19)

(11)

EP 3 645 837 A1

(12)

(43) Date of publication: 06.05.2020 Bulletin 2020/19 (21) Application number: 17758942.1 (22) Date of filing: 27.06.2017

(51) International Patent Classification (IPC):  E21B 47/06(2012.01) E21B 49/10(2006.01) E21B 49/08(2006.01) (86) International application number: PCT/IB2017/000974 (87) International publication number: WO 2019/002901 (03.01.2019 Gazette 2019/01)

(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 Designated Validation States: MA MD (71) Applicant: Total SA 92400 Courbevoie (FR)	(72) Inventor: VENTRE, Pierre 64018 Pau Cedex (FR) (74) Representative: Lavoix  2, place d'Estienne d'Orves 75441 Paris Cedex 09 75441 Paris Cedex 09 (FR)