(19)

(11)

EP 2 300 683 A1

(12)

(43) Date of publication: 30.03.2011 Bulletin 2011/13 (21) Application number: 09758575.6 (22) Date of filing: 04.06.2009

(51) International Patent Classification (IPC):  E21B 19/16(2006.01) (86) International application number: PCT/NO2009/000208 (87) International publication number: WO 2009/148328 (10.12.2009 Gazette 2009/50)

(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 TR Designated Extension States: AL BA RS (30) Priority: 05.06.2008 NO 20082639 (71) Applicant: Aker MH AS 4604 Kristiansand (NO)	(72) Inventor: OLSEN, Olav N-4023 Stavanger (NO) (74) Representative: Onsagers AS  Universitetsgaten 7 P.O. Box 6963 St. Olavs plass 0130 Oslo 0130 Oslo (NO)