(19)

(11)

EP 2 576 333 A1

(12)

(43) Date of publication: 10.04.2013 Bulletin 2013/15 (21) Application number: 11789284.4 (22) Date of filing: 06.06.2011

(51) International Patent Classification (IPC):  B63B 27/34(2006.01) E21B 17/01(2006.01) B63B 27/24(2006.01) (86) International application number: PCT/DK2011/050198 (87) International publication number: WO 2011/150945 (08.12.2011 Gazette 2011/49)

(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: 04.06.2010 DK 201000478 (71) Applicant: National Oilwell Varco Denmark I/S 2605 Brøndby (DK)	(72) Inventors: PEDERSEN, Tommy DK-2300 Copenhagen (DK) CHRISTENSEN, Claus, Dencker DK-2620 Albertslund (DK) (74) Representative: Hegner, Anette  Hegner & Partners A/S Banemarksvej 50 2605 Brøndby 2605 Brøndby (DK)