(19)

(11)

EP 4 453 377 A1

(12)

(43) Date of publication: 30.10.2024 Bulletin 2024/44 (21) Application number: 22926933.7 (22) Date of filing: 21.02.2022

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 43/00(2006.01) E21B 43/17(2006.01) E21B 21/08(2006.01) (52) Cooperative Patent Classification (CPC): E21B 43/12; E21B 2200/20 (86) International application number: PCT/IB2022/051515 (87) International publication number: WO 2023/156830 (24.08.2023 Gazette 2023/34)

(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 (71) Applicant: Abu Dhabi National Oil Company Abu Dhabi 00971 (AE)	(72) Inventor: MERRILL, Robert Abu Dhabi National Oil Company P.O. Box 898 Abu Dhabi, 00971 (AE) (74) Representative: Bardehle Pagenberg Partnerschaft mbB Patentanwälte Rechtsanwälte  Prinzregentenplatz 7 81675 München 81675 München (DE)