(19)

(11)

EP 2 561 176 A1

(12)

(43) Date of publication: 27.02.2013 Bulletin 2013/09 (21) Application number: 11772326.2 (22) Date of filing: 18.04.2011

(51) International Patent Classification (IPC):  E21B 33/138(2006.01) E21D 20/02(2006.01) E21D 9/00(2006.01) (86) International application number: PCT/SE2011/050474 (87) International publication number: WO 2011/133096 (27.10.2011 Gazette 2011/43)

(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 (30) Priority: 19.04.2010 SE 1050382 (71) Applicant: Gurlita GMA AB 686 21 Sunne (SE)	(72) Inventor: ERIKSSON, Håkan S-685 96 Östra Ämtervik (SE) (74) Representative: Johansson, Lars E.  Hynell Patenttjänst AB P.O. Box 138 683 23 Hagfors 683 23 Hagfors (SE)