(19)

(11)

EP 2 315 908 A1

(12)

(43) Date of publication: 04.05.2011 Bulletin 2011/18 (21) Application number: 09793966.4 (22) Date of filing: 10.07.2009

(51) International Patent Classification (IPC):  E21B 33/13(2006.01) (86) International application number: PCT/EP2009/058842 (87) International publication number: WO 2010/004035 (14.01.2010 Gazette 2010/02)

(84) Designated Contracting States: 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 SE SI SK SM TR Designated Extension States: AL BA RS (30) Priority: 11.07.2008 EP 08012547 (71) Applicant: Welltec A/S 3450 Allerød (DK)	(72) Inventor: HALLUNDBÆK, Jørgen DK-3230 Græsted (DK) (74) Representative: Hoffmann Dragsted A/S  Rådhuspladsen 16 1550 Copenhagen V 1550 Copenhagen V (DK)