(19)

(11)

EP 1 989 397 A1

(12)

(43) Date of publication: 12.11.2008 Bulletin 2008/46 (21) Application number: 07709225.2 (22) Date of filing: 12.02.2007

(51) International Patent Classification (IPC):  E21B 49/08(2006.01) (86) International application number: PCT/NO2007/000043 (87) International publication number: WO 2007/091900 (16.08.2007 Gazette 2007/33)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 10.02.2006 NO 20060659 (71) Applicant: Inwell Technology AS 5178 Loddefjord Norway (NO)	(72) Inventor: LØKEN, Helge 5178 Loddefjord (NO) (74) Representative: Onsagers Ltd  c/o Innovation Norway 5 Lower Regent Street London SW1Y 4LR London SW1Y 4LR (GB)