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(11)

EP 4 558 703 A1

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(43) Date of publication: 28.05.2025 Bulletin 2025/22 (21) Application number: 23745437.6 (22) Date of filing: 14.07.2023

(51) International Patent Classification (IPC):  E21B 49/00(2006.01) E02D 1/04(2006.01) E02D 1/02(2006.01) G01N 15/08(2006.01) (52) Cooperative Patent Classification (CPC): E21B 49/008; E21B 49/003; E02D 1/027; G01N 15/0826 (86) International application number: PCT/EP2023/069718 (87) International publication number: WO 2024/017803 (25.01.2024 Gazette 2024/04)

(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: 22.07.2022 NL 2032573 (71) Applicant: FNV IP B.V. 2264 SG Leidschendam (NL)	(72) Inventor: SNACKEN, Barbara 2264 SG Leidschendam (NL) (74) Representative: FNV Intellectual Property  Veurse Achterweg 10 2264 SG Leidschendam 2264 SG Leidschendam (NL)