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(11)

EP 4 824 385 A1

(12)

(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 24838045.3 (22) Date of filing: 13.12.2024

(51) International Patent Classification (IPC):  E21B 29/00(2006.01) E21B 47/002(2012.01) E21B 47/107(2012.01) E21B 47/117(2012.01) E21B 29/12(2006.01) E21B 47/095(2012.01) E21B 47/113(2012.01) E21B 47/06(2012.01) (52) Cooperative Patent Classification (CPC): E21B 29/005; E21B 29/12; E21B 47/095; E21B 47/0025 (86) International application number: PCT/NO2024/050280 (87) International publication number: WO 2025/127939 (19.06.2025 Gazette 2025/25)

(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 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: 14.12.2023 NO 20231353 (71) Applicant: Archer Oiltools AS 4068 Stavanger (NO)	(72) Inventors: TORVESTAD, Bjørn Tore 4020 Stavanger (NO) FLISS, Andreas 4027 Stavanger (NO) (74) Representative: Bryn Aarflot AS  Patent Stortingsgata 8 0161 Oslo 0161 Oslo (NO)