(19)

(11)

EP 4 028 628 A1

(12)

(43) Date of publication: 20.07.2022 Bulletin 2022/29 (21) Application number: 20864076.3 (22) Date of filing: 02.09.2020

(51) International Patent Classification (IPC):  E21B 17/07(2006.01) E21B 17/042(2006.01) E21B 17/10(2006.01) (52) Cooperative Patent Classification (CPC): E21B 12/00 (86) International application number: PCT/US2020/049019 (87) International publication number: WO 2021/050335 (18.03.2021 Gazette 2021/11)

(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: KH MA MD TN (30) Priority: 12.09.2019 US 201916568809 (71) Applicant: BAKER HUGHES HOLDINGS LLC Houston, TX 77073 (US)	(72) Inventor: HOHL, Andreas Houston, TX 77073 (US) (74) Representative: Dehns  St. Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)