(19)

(11)

EP 3 921 512 A1

(12)

(43) Date of publication: 15.12.2021 Bulletin 2021/50 (21) Application number: 20751883.8 (22) Date of filing: 03.02.2020

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) F04B 53/14(2006.01) F04B 47/08(2006.01) (52) Cooperative Patent Classification (CPC): F04B 9/105; F04B 47/08 (86) International application number: PCT/US2020/016409 (87) International publication number: WO 2020/163232 (13.08.2020 Gazette 2020/33)

(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: 04.02.2019 US 201962800863 P 31.01.2020 US 202016779237 (71) Applicant: Baker Hughes Oilfield Operations LLC Houston, TX 77073 (US)	(72) Inventors: LU, Xiaonan Houston, Texas 77073 (US) STRATTAN, Scott Clayton Houston, Texas 77073 (US) HONG, Lyon Euiyeol Houston, Texas 77073 (US) PERISHO, Randal Houston, Texas 77073 (US) (74) Representative: Dehns  St. Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)