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EP 4 256 177 A1

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(43) Date of publication: 11.10.2023 Bulletin 2023/41 (21) Application number: 21904583.8 (22) Date of filing: 07.12.2021

(51) International Patent Classification (IPC):  E21B 47/06(2012.01) E21B 43/16(2006.01) E21B 47/10(2012.01) E21B 47/26(2012.01) (52) Cooperative Patent Classification (CPC): E21B 47/10; E21B 43/00; E21B 2200/20 (86) International application number: PCT/US2021/072769 (87) International publication number: WO 2022/126092 (16.06.2022 Gazette 2022/24)

(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 (30) Priority: 07.12.2020 US 202063122346 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 MK MT NL NO PL PT RO RS SE SI SK SM TR

(72) Inventors: HAVRE, Kjetil 1383 Asker (NO) TRUDVANG, Christian 1383 Asker (NO) KJØRREFJORD, Gustav 1383 Asker (NO) (74) Representative: Schlumberger Intellectual Property Department  Parkstraat 83 2514 JG Den Haag 2514 JG Den Haag (NL)