(19)

(11)

EP 2 106 493 A1

(12)

(43) Date of publication: 07.10.2009 Bulletin 2009/41 (21) Application number: 08712646.2 (22) Date of filing: 22.01.2008

(51) International Patent Classification (IPC):  E21B 23/00(2006.01) E21B 4/18(2006.01) (86) International application number: PCT/NO2008/000018 (87) International publication number: WO 2008/091157 (31.07.2008 Gazette 2008/31)

(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 (30) Priority: 23.01.2007 NO 20070416 28.02.2007 NO 20071150 (71) Applicant: Wellbore Solutions AS 4052 Røyneberg, Forus (NO)	(72) Inventor: RAUNHOLT, Lars N-4052 Røyneberg, Forus (NO) (74) Representative: Heggstad, Jon Dagson  Bryn Aarflot AS P.O. Box 449 Sentrum 0104 Oslo 0104 Oslo (NO)