(19)

(11)

EP 3 601 729 A1

(12)

(43) Date of publication: 05.02.2020 Bulletin 2020/06 (21) Application number: 18711946.6 (22) Date of filing: 20.03.2018

(51) International Patent Classification (IPC):  E21B 47/02(2006.01) E21B 47/12(2012.01) E21B 47/09(2012.01) (86) International application number: PCT/EP2018/056922 (87) International publication number: WO 2018/172300 (27.09.2018 Gazette 2018/39)

(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: KH MA MD TN (30) Priority: 21.03.2017 EP 17162044 (71) Applicant: Welltec Oilfield Solutions AG 6300 Zug (CH)	(72) Inventor: NESGAARD, Carsten 3450 Allerød (DK) (74) Representative: Hoffmann Dragsted A/S  Rådhuspladsen 16 1550 Copenhagen V 1550 Copenhagen V (DK)