(19)

(11)

EP 3 066 291 A2

(12)

(88) Date of publication A3: 25.06.2015 (43) Date of publication: 14.09.2016 Bulletin 2016/37 (21) Application number: 14798740.8 (22) Date of filing: 04.11.2014

(51) International Patent Classification (IPC):  E21B 19/16(2006.01) (86) International application number: PCT/EP2014/073660 (87) International publication number: WO 2015/063316 (07.05.2015 Gazette 2015/18)

(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 (30) Priority: 04.11.2013 SE 1351304 (71) Applicant: Totech Industriutveckling AB 660 11 Billingsfors (SE)	(72) Inventors: HAGEVÅG, Olof Emil S-660 10 Dals-Långed (SE) TVETER, Tommy S-662 31 Åmål (SE) (74) Representative: Johansson, Lars E.  Hynell Patenttjänst AB P.O. Box 138 683 23 Hagfors 683 23 Hagfors (SE)