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(11)

EP 4 816 668 A1

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(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24827321.1 (22) Date of filing: 21.11.2024

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 47/09(2012.01) E21B 47/008(2012.01) (52) Cooperative Patent Classification (CPC): E21B 43/126; E21B 47/008; E21B 47/09 (86) International application number: PCT/US2024/056882 (87) International publication number: WO 2025/117325 (05.06.2025 Gazette 2025/23)

(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: GE KH MA MD TN (30) Priority: 29.11.2023 US 202318523267 (71) Applicant: Saudi Arabian Oil Company Dhahran 31311 (SA)	(72) Inventors: SETIADI, Bagus Wahyu Dhahran, 31311 (SA) ALVAREZ, Gustavo Ariel Dhahran, 31311 (SA) CEPEDA GOMEZ, Felix A. Dhahran, 31311 (SA) HAJJI, Abdulrazak M. Dhahran, 31311 (SA) (74) Representative: Fish & Richardson P.C.  Highlight Business Towers Mies-van-der-Rohe-Straße 8 80807 München 80807 München (DE)