(19)

(11)

EP 4 577 725 A1

(12)

(43) Date of publication: 02.07.2025 Bulletin 2025/27 (21) Application number: 23857809.0 (22) Date of filing: 25.08.2023

(51) International Patent Classification (IPC):  E21B 43/16(2006.01) B63B 35/44(2006.01) F17C 1/00(2006.01) (52) Cooperative Patent Classification (CPC): E21B 41/0064 (86) International application number: PCT/NO2023/060038 (87) International publication number: WO 2024/043790 (29.02.2024 Gazette 2024/09)

(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: 25.08.2022 GB 202212382 (71) Applicant: Equinor Energy AS 4035 Stavanger (NO)	(72) Inventors: LOTHE, Per 4035 Stavanger (NO) SAMUELSBERG, Arild 4035 Stavanger (NO) (74) Representative: Dehns  10 Old Bailey London EC4M 7NG London EC4M 7NG (GB)