(19)

(11)

EP 4 263 998 A1

(12)

(43) Date of publication: 25.10.2023 Bulletin 2023/43 (21) Application number: 21830352.7 (22) Date of filing: 16.12.2021

(51) International Patent Classification (IPC):  E21B 4/00(2006.01) E21B 10/08(2006.01) (52) Cooperative Patent Classification (CPC): E21B 10/08; E21B 4/16; E21B 7/002 (86) International application number: PCT/NL2021/050770 (87) International publication number: WO 2022/131916 (23.06.2022 Gazette 2022/25)

(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: 16.12.2020 NL 2027127 (71) Applicant: Van Oord Offshore Wind B.V. 4207 HN Gorinchem (NL)	(72) Inventor: STEINBUSCH, Peter Jan 3039 HM Rotterdam (NL) (74) Representative: Nederlandsch Octrooibureau  P.O. Box 29720 2502 LS The Hague 2502 LS The Hague (NL)