(19)

(11)

EP 2 739 810 A2

(12)

(88) Date of publication A3: 14.11.2013 (43) Date of publication: 11.06.2014 Bulletin 2014/24 (21) Application number: 12745663.0 (22) Date of filing: 30.07.2012

(51) International Patent Classification (IPC):  E21B 7/20(2006.01) E21B 4/14(2006.01) (86) International application number: PCT/EP2012/064869 (87) International publication number: WO 2013/017560 (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: 02.08.2011 CH 12892011 (71) Applicants: Plumettaz Holding S.A. 1880 Bex (CH) EHTP, Entreprise Hydraulique Et Travaux Publics 13103 Saint-Etienne-du-Grès (FR)	(72) Inventor: WACINSKI, Andrzej 1880 Bex (CH) (74) Representative: Vigand, Philippe et al Novagraaf International SA 3 chemin de l'Echo 1213 Onex Geneva 1213 Onex Geneva (CH)