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(11)

EP 4 519 531 A1

(12)

(43) Date of publication: 12.03.2025 Bulletin 2025/11 (21) Application number: 23725170.7 (22) Date of filing: 04.05.2023

(51) International Patent Classification (IPC):  E21B 7/20(2006.01) E21B 7/04(2006.01) E21B 7/26(2006.01) E21B 19/08(2006.01) (52) Cooperative Patent Classification (CPC): E21B 7/20; E21B 7/26; E21B 7/046; E21B 19/08 (86) International application number: PCT/EP2023/061823 (87) International publication number: WO 2023/213957 (09.11.2023 Gazette 2023/45)

(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: 04.05.2022 NL 2031778 (71) Applicant: Kormee B.V. 3911 TZ RHENEN (NL)	(72) Inventor: KORPERSHOEK, Pieter 3911 TZ Rhenen (NL) (74) Representative: EP&C  P.O. Box 3241 2280 GE Rijswijk 2280 GE Rijswijk (NL)