(19)

(11)

EP 3 755 877 A1

(12)

(43) Date of publication: 30.12.2020 Bulletin 2020/53 (21) Application number: 19707097.2 (22) Date of filing: 19.02.2019

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) F04B 47/02(2006.01) E21B 43/38(2006.01) (86) International application number: PCT/GB2019/050445 (87) International publication number: WO 2019/158952 (22.08.2019 Gazette 2019/34)

(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: 19.02.2018 BR 102018003152 (71) Applicant: Petroleo Brasileiro S.A. - PETROBRAS Rio de Janeiro (BR)	(72) Inventor: FERREIRA GAGLIOTI, Silvio Fatima São Mateus (BR) (74) Representative: Herzog IP Patentanwalts GmbH  Steinstraße 16-18 40212 Düsseldorf 40212 Düsseldorf (DE)