(19)

(11)

EP 1 627 131 A1

(12)

(43) Date of publication: 22.02.2006 Bulletin 2006/08 (21) Application number: 04730384.7 (22) Date of filing: 29.04.2004

(51) International Patent Classification (IPC):  E21B 19/10(1968.09) (86) International application number: PCT/NO2004/000124 (87) International publication number: WO 2004/097164 (11.11.2004 Gazette 2004/46)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 02.05.2003 NO 20031994 02.05.2003 US 467128 P (71) Applicant: HD Oil Technology AS 4095 Stavanger (NO)	(72) Inventor: DYKESTEEN, Helge N-4020 Stavanger (NO) (74) Representative: Briddes, Sam  Onsagers Ltd c/o Innovation Norway 5 Lower Regent Street London SW1Y 4LR London SW1Y 4LR (GB)