(19)

(11)

EP 2 181 247 A1

(12)

(43) Date of publication: 05.05.2010 Bulletin 2010/18 (21) Application number: 08793896.5 (22) Date of filing: 06.08.2008

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) (86) International application number: PCT/NO2008/000284 (87) International publication number: WO 2009/020396 (12.02.2009 Gazette 2009/07)

(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: 07.08.2007 NO 20074105 (71) Applicant: Petroleum Technology Company AS 4032 Stavanger (NO)	(72) Inventors: STOKKA, Øyvind N-4315 Sandnes (NO) SEVHEIM, Ole N-4019 Stavanger (NO) (74) Representative: Onsagers Ltd  c/o Innovation Norway 5 Lower Regent Street London SW1Y 4LR London SW1Y 4LR (GB)