(19)

(11)

EP 4 396 439 A1

(12)

(43) Date of publication: 10.07.2024 Bulletin 2024/28 (21) Application number: 22769672.1 (22) Date of filing: 29.08.2022

(51) International Patent Classification (IPC):  E21B 19/00(2006.01) E21B 3/04(2006.01) (52) Cooperative Patent Classification (CPC): E21B 3/04; E21B 19/00 (86) International application number: PCT/EP2022/073905 (87) International publication number: WO 2023/031092 (09.03.2023 Gazette 2023/10)

(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: 03.09.2021 NL 2029121 (71) Applicant: Ter Bron Groep B.V. 7825 VM Emmen (NL)	(72) Inventor: POORT, Björn 7828 BL EMMEN (NL) (74) Representative: EP&C  P.O. Box 3241 2280 GE Rijswijk 2280 GE Rijswijk (NL)