(19)

(11)

EP 3 230 551 A1

(12)

(43) Date of publication: 18.10.2017 Bulletin 2017/42 (21) Application number: 15805508.7 (22) Date of filing: 08.12.2015

(51) International Patent Classification (IPC):  E21B 17/042(2006.01) E21B 17/08(2006.01) (86) International application number: PCT/EP2015/078967 (87) International publication number: WO 2016/091871 (16.06.2016 Gazette 2016/24)

(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 (30) Priority: 09.12.2014 FR 1462123 (71) Applicant: Vallourec Oil and Gas France 59620 Aulnoye-Aymeries (FR)	(72) Inventors: CARROIS, Fabien 59300 Valenciennes (FR) DAVID, Didier 59530 Ruesnes (FR) (74) Representative: Cabinet Netter  36, avenue Hoche 75008 Paris 75008 Paris (FR)