(19)

(11)

EP 2 831 368 A1

(12)

(43) Date of publication: 04.02.2015 Bulletin 2015/06 (21) Application number: 13714891.2 (22) Date of filing: 27.03.2013

(51) International Patent Classification (IPC):  E21B 33/127(2006.01) (86) International application number: PCT/EP2013/056470 (87) International publication number: WO 2013/144183 (03.10.2013 Gazette 2013/40)

(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: 30.03.2012 EP 12162461 (71) Applicant: Welltec A/S 3450 Allerød (DK)	(72) Inventors: HALLUNDBÆK, Jørgen DK-3230 Græsted (DK) ANDERSEN, Tomas, Sune DK-3000 Helsingør (DK) (74) Representative: Hoffmann Dragsted A/S  Rådhuspladsen 16 1550 Copenhagen V 1550 Copenhagen V (DK)