(19)

(11)

EP 3 924 600 A1

(12)

(43) Date of publication: 22.12.2021 Bulletin 2021/51 (21) Application number: 19933575.3 (22) Date of filing: 19.06.2019

(51) International Patent Classification (IPC):  E21B 44/00(2006.01) E21B 47/12(2012.01) (52) Cooperative Patent Classification (CPC): E21B 44/00; E21B 47/10 (86) International application number: PCT/US2019/037976 (87) International publication number: WO 2020/256720 (24.12.2020 Gazette 2020/52)

(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 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77032 (US)	(72) Inventors: QUERO, Philippe Houston, Texas 77041 (US) BIVENS, Eric Littleton, Colorado 80123 (US) (74) Representative: Palmer, Lloyd  A.A. Thornton & Co. Octagon Point 5 Cheapside London EC2V 6AA London EC2V 6AA (GB)