(19)

(11)

EP 3 966 417 A1

(12)

(43) Date of publication: 16.03.2022 Bulletin 2022/11 (21) Application number: 19937952.0 (22) Date of filing: 18.09.2019

(51) International Patent Classification (IPC):  E21B 17/01(2006.01) E21B 17/04(2006.01) E21B 17/10(2006.01) E21B 17/02(2006.01) E21B 34/10(2006.01) (52) Cooperative Patent Classification (CPC): E21B 17/041; E21B 17/20; E21B 19/22 (86) International application number: PCT/US2019/051718 (87) International publication number: WO 2021/011021 (21.01.2021 Gazette 2021/03)

(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: 12.07.2019 US 201962873254 P 17.09.2019 US 201916573193 (71) Applicant: Halliburton Energy Services Inc. Houston, Texas 77032-3219 (US)	(72) Inventors: GREIG, Scott Robert Houston, Texas 77032-3219 (US) SHEPHERD, Iain James Houston, Texas 77032-3219 (US) SAVENKOVA, Anna Houston, Texas 77032-3219 (US) (74) Representative: McWilliams, David John  Withers & Rogers LLP 2 London Bridge London SE1 9RA London SE1 9RA (GB)