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(11)

EP 4 515 071 A1

(12)

(43) Date of publication: 05.03.2025 Bulletin 2025/10 (21) Application number: 23722860.6 (22) Date of filing: 26.04.2023

(51) International Patent Classification (IPC):  E21B 4/10(2006.01) E21B 23/00(2006.01) E21B 23/04(2006.01) E21B 29/00(2006.01) E21B 37/02(2006.01) E21B 7/24(2006.01) E21B 23/01(2006.01) E21B 23/14(2006.01) E21B 31/00(2006.01) E21B 47/017(2012.01) (52) Cooperative Patent Classification (CPC): E21B 4/10; E21B 7/24; E21B 23/001; E21B 23/01; E21B 23/0411; E21B 23/14; E21B 31/005; E21B 29/002; E21B 37/02; E21B 47/017 (86) International application number: PCT/EP2023/060993 (87) International publication number: WO 2023/209026 (02.11.2023 Gazette 2023/44)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 27.04.2022 DK PA202200397 (71) Applicant: Welltec A/S 3450 Allerød (DK)	(72) Inventor: ANDERSEN, Tomas Sune 6300 ZUG (CH) (74) Representative: Dragsted Partners A/S  Rådhuspladsen 16 1550 Copenhagen V 1550 Copenhagen V (DK)