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(11)

EP 3 510 244 A1

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(43) Date of publication: 17.07.2019 Bulletin 2019/29 (21) Application number: 17849709.5 (22) Date of filing: 11.09.2017

(51) International Patent Classification (IPC):  E21B 41/00(2006.01) E21B 43/25(2006.01) E21B 7/00(2006.01) (86) International application number: PCT/US2017/050924 (87) International publication number: WO 2018/049311 (15.03.2018 Gazette 2018/11)

(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: MA MD (30) Priority: 09.09.2016 US 201662385671 P (71) Applicants: Services Pétroliers Schlumberger 75007 Paris (FR) FR  Schlumberger Technology B.V. 2514 JG 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: POTAPENKO, Dmitriy Ivanovich Sugar Land, Texas 77478 (US) UTTER, Robert Sugar Land, Texas 77479 (US) PIPCHUK, Douglas London London Greater London SW1E 6AJ (GB) (74) Representative: Schlumberger Intellectual Property Department  Parkstraat 83 2514 JG Den Haag 2514 JG Den Haag (NL)