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(11)

EP 1 869 281 A1

(12)

(43) Date of publication: 26.12.2007 Bulletin 2007/52 (21) Application number: 06716784.1 (22) Date of filing: 31.03.2006

(51) International Patent Classification (IPC):  E21B 15/00(2006.01) E21B 7/02(2006.01) E21B 19/086(2006.01) (86) International application number: PCT/NO2006/000119 (87) International publication number: WO 2006/110040 (19.10.2006 Gazette 2006/42)

(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: 11.04.2005 NO 20051764 (71) Applicant: Fossbakken, Aksel 4027 Stavanger (NO)	(72) Inventor: SANGEDAL, Jan, Øyvind N-4070 Randaberg (NO) (74) Representative: Hedley, Nicholas James Matthew et al Kilburn & Strode 20 Red Lion Street London WC1R 4PJ London WC1R 4PJ (GB)