(19)

(11)

EP 2 370 660 A1

(12)

(43) Date of publication: 05.10.2011 Bulletin 2011/40 (21) Application number: 09832986.5 (22) Date of filing: 13.10.2009

(51) International Patent Classification (IPC):  E21B 10/38(2006.01) E21B 21/08(2006.01) E21B 10/60(2006.01) (86) International application number: PCT/FI2009/050820 (87) International publication number: WO 2010/070190 (24.06.2010 Gazette 2010/25)

(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 MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 17.12.2008 FI 20086206 (71) Applicant: OY Atlas Copco Rotex AB 33330 Tampere (FI)	(72) Inventor: AHONEN, Jukka FI-33530 Tampere (FI) (74) Representative: Kangasmäki, Reijo Holger  Finnish Patent Consulting FPC Patenttikonsultointi Kangasmäki Oy PL 25 FIN-33401 Tampere FIN-33401 Tampere (FI)