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EP 4 051 865 A1

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(43) Date of publication: 07.09.2022 Bulletin 2022/36 (21) Application number: 20883020.8 (22) Date of filing: 27.10.2020

(51) International Patent Classification (IPC):  E21B 41/00(2006.01) E21B 43/12(2006.01) E21B 47/008(2012.01) E21B 47/26(2012.01) (52) Cooperative Patent Classification (CPC): E21B 21/08; E21B 21/06 (86) International application number: PCT/US2020/070700 (87) International publication number: WO 2021/087509 (06.05.2021 Gazette 2021/18)

(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: 31.10.2019 US 201962929064 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) Inventor: LAFOND, Aurore 92142 Clamart CEDEX (FR) (74) Representative: Schlumberger Intellectual Property Department  Parkstraat 83 2514 JG Den Haag 2514 JG Den Haag (NL)