(19)

(11)

EP 3 411 559 A2

(12)

(88) Date of publication A3: 09.11.2017 (43) Date of publication: 12.12.2018 Bulletin 2018/50 (21) Application number: 17705967.2 (22) Date of filing: 02.02.2017

(51) International Patent Classification (IPC):  E21B 29/04(2006.01) E21B 19/16(2006.01) (86) International application number: PCT/NL2017/050071 (87) International publication number: WO 2017/135823 (10.08.2017 Gazette 2017/32)

(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: MA MD (30) Priority: 02.02.2016 NL 2016209 30.06.2016 NL 2017081 (71) Applicant: Itrec B.V. 3115 HH Schiedam (NL)	(72) Inventors: ROODENBURG, Joop 3115 HH Schiedam (NL) DE MUL, Arthur Alexander 3115 HH Schiedam (NL) ROODENBURG, David 3115 HH Schiedam (NL) (74) Representative: EP&C  P.O. Box 3241 2280 GE Rijswijk 2280 GE Rijswijk (NL)