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EP 4 486 976 A1

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(43) Date of publication: 08.01.2025 Bulletin 2025/02 (21) Application number: 23764160.0 (22) Date of filing: 03.03.2023

(51) International Patent Classification (IPC):  E21B 47/06(2012.01) E21B 4/02(2006.01) E21B 7/04(2006.01) E21B 47/024(2006.01) E21B 43/12(2006.01) (52) Cooperative Patent Classification (CPC): E21B 44/00 (86) International application number: PCT/US2023/063648 (87) International publication number: WO 2023/168382 (07.09.2023 Gazette 2023/36)

(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: 04.03.2022 US 202263268879 P (71) Applicants: Services Pétroliers Schlumberger 75007 Paris (FR) FR  GeoQuest Systems B.V. 2586 BJ The Hague (NL) AL AT BE BG CH CY CZ DE DK EE ES FI 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

(72) Inventor: BA, Samba Beijing 100084 (CN) (74) Representative: Schlumberger Intellectual Property Department  Parkstraat 83 2514 JG Den Haag 2514 JG Den Haag (NL)