(19)

(11)

EP 2 176 508 A2

(12)

(88) Date of publication A3: 05.11.2009 (43) Date of publication: 21.04.2010 Bulletin 2010/16 (21) Application number: 08766940.4 (22) Date of filing: 23.06.2008

(51) International Patent Classification (IPC):  E21B 19/16(2006.01) (86) International application number: PCT/NO2008/000230 (87) International publication number: WO 2009/005362 (08.01.2009 Gazette 2009/02)

(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 MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 03.07.2007 NO 20073411 (71) Applicant: Aker MH AS 4604 Kristiansand (NO)	(72) Inventor: OLSEN, Olav 4023 Stavanger (NO) (74) Representative: Onsagers Ltd  c/o Innovation Norway 5 Lower Regent Street London SW1Y 4LR London SW1Y 4LR (GB)