(19)

(11)

EP 3 911 835 A1

(12)

(43) Date of publication: 24.11.2021 Bulletin 2021/47 (21) Application number: 20700760.0 (22) Date of filing: 09.01.2020

(51) International Patent Classification (IPC):  E21B 19/14(2006.01) (52) Cooperative Patent Classification (CPC): E21B 19/14 (86) International application number: PCT/NL2020/050011 (87) International publication number: WO 2020/149737 (23.07.2020 Gazette 2020/30)

(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: 14.01.2019 NL 2022399 (71) Applicant: Itrec B.V. 3115 HH Schiedam (NL)	(72) Inventor: WIJNING, Diederick Bernardus 3115 HH SCHIEDAM (NL) (74) Representative: EP&C  P.O. Box 3241 2280 GE Rijswijk 2280 GE Rijswijk (NL)