(19)

(11)

EP 3 710 669 A1

(12)

(43) Date of publication: 23.09.2020 Bulletin 2020/39 (21) Application number: 18811461.5 (22) Date of filing: 16.11.2018

(51) International Patent Classification (IPC):  E21B 25/02(2006.01) E21B 34/10(2006.01) E21B 33/12(2006.01) E21B 7/06(2006.01) (86) International application number: PCT/EP2018/081552 (87) International publication number: WO 2019/096990 (23.05.2019 Gazette 2019/21)

(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: 17.11.2017 NO 20171838 (71) Applicant: HUYGENS AS 7015 Trondheim (NO)	(72) Inventor: BORG, Eirik 7015 Trondheim (NO) (74) Representative: Protector IP AS  Pilestredet 33 0166 Oslo 0166 Oslo (NO)