(19)

(11)

EP 4 577 718 A1

(12)

(43) Date of publication: 02.07.2025 Bulletin 2025/27 (21) Application number: 23858314.0 (22) Date of filing: 24.08.2023

(51) International Patent Classification (IPC):  E21B 10/573(2006.01) E21B 10/567(2006.01) E21B 10/633(2006.01) E21B 10/627(2006.01) (52) Cooperative Patent Classification (CPC): E21B 10/633; E21B 10/573 (86) International application number: PCT/US2023/072850 (87) International publication number: WO 2024/044707 (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: 24.08.2022 US 202263400595 P (71) Applicant: National Oilwell Varco, L.P. Houston, TX 77036 (US)	(72) Inventor: MIESS, David P. Magnolia, TX 77354-2683 (US) (74) Representative: Beck Greener LLP  Fulwood House 12 Fulwood Place London WC1V 6HR London WC1V 6HR (GB)