(19)

(11)

EP 2 041 390 A1

(12)

(43) Date of publication: 01.04.2009 Bulletin 2009/14 (21) Application number: 07793918.9 (22) Date of filing: 09.07.2007

(51) International Patent Classification (IPC):  E21B 31/107(2006.01) E21B 4/10(2006.01) (86) International application number: PCT/NO2007/000266 (87) International publication number: WO 2008/016308 (07.02.2008 Gazette 2008/06)

(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 MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 13.07.2006 NO 20063252 (71) Applicant: Petro Tools AS 4052 Røyneberg (NO)	(72) Inventor: AKSELBERG, Frank, Ove 4306 Sandnes (NO) (74) Representative: Tafjord, Harald  Bryn Aarflot AS P.O. Box 449 0104 Oslo 0104 Oslo (NO)