(19)

(11)

EP 2 912 261 A1

(12)

(43) Date of publication: 02.09.2015 Bulletin 2015/36 (21) Application number: 13783058.4 (22) Date of filing: 25.10.2013

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) F04B 47/08(2006.01) F04B 9/103(2006.01) F04B 47/12(2006.01) (86) International application number: PCT/EP2013/072401 (87) International publication number: WO 2014/064254 (01.05.2014 Gazette 2014/18)

(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: 26.10.2012 EP 12190177 (71) Applicant: Welltec A/S 3450 Allerød (DK)	(72) Inventors: HALLUNDBÆK, Jørgen DK-3230 Græsted (DK) VASQUES, Ricardo Reves DK-2840 Holte (DK) (74) Representative: Hoffmann Dragsted A/S  Rådhuspladsen 16 1550 Copenhagen V 1550 Copenhagen V (DK)