(19)

(11)

EP 1 558 832 A1

(12)

(43) Date of publication: 03.08.2005 Bulletin 2005/31 (21) Application number: 03810726.4 (22) Date of filing: 24.09.2003

(51) International Patent Classification (IPC)7: E21B 10/26, E21B 7/28 (86) International application number: PCT/SE2003/001485 (87) International publication number: WO 2004/042183 (21.05.2004 Gazette 2004/21)

(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 PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 07.11.2002 SE 0203286 (71) Applicant: Atlas Copco Secoroc AB 737 25 Fagersta (SE)	(72) Inventor: VIRTANEN, Stefan S-738 34 Norberg (SE) (74) Representative: Karlström, Lennart et al Noréns Patentbyra AB,Box 10198 100 55 Stockholm 100 55 Stockholm (SE)