(19)

(11)

EP 3 735 514 A1

(12)

(43) Date of publication: 11.11.2020 Bulletin 2020/46 (21) Application number: 18898967.7 (22) Date of filing: 18.12.2018

(51) International Patent Classification (IPC):  E21D 9/10(2006.01) E21B 3/00(2006.01) E21B 7/00(2006.01) E21D 9/11(2006.01) E21B 4/18(2006.01) (86) International application number: PCT/NO2018/050314 (87) International publication number: WO 2019/135682 (11.07.2019 Gazette 2019/28)

(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: 02.01.2018 NO 20180005 07.11.2018 NO 20181428 (71) Applicant: Norhard AS 4441 Tonstad (NO)	(72) Inventor: HAUGHOM, Per Olav 4440 Tonstad (NO) (74) Representative: Håmsø Patentbyrå AS  P.O. Box 171 4301 Sandnes 4301 Sandnes (NO)