(19)

(11)

EP 3 400 363 A1

(12)

(43) Date of publication: 14.11.2018 Bulletin 2018/46 (21) Application number: 17700909.9 (22) Date of filing: 06.01.2017

(51) International Patent Classification (IPC):  E21B 33/035(2006.01) (86) International application number: PCT/EP2017/050260 (87) International publication number: WO 2017/118727 (13.07.2017 Gazette 2017/28)

(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: MA MD (30) Priority: 06.01.2016 NO 20160019 (71) Applicant: BTI AS 5237 Rådal (NO)	(72) Inventors: DAHLE, Bjørn Olav N-5237 Rådal (NO) LIEN, Birger, W-F N-5081 Bergen (NO) (74) Representative: Onsagers AS  P.O. Box 1813 Vika 0123 Oslo 0123 Oslo (NO)