(19)

(11)

EP 2 675 982 A1

(12)

(43) Date of publication: 25.12.2013 Bulletin 2013/52 (21) Application number: 12839207.3 (22) Date of filing: 12.07.2012

(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/FI2012/050729 (87) International publication number: WO 2013/156667 (24.10.2013 Gazette 2013/43)

(84) Designated Contracting States: AL 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 RS SE SI SK SM TR (71) Applicant: OY Atlas Copco Rotex AB 33330 Tampere (FI)	(72) Inventors: VIRJULA, Antti x (FI) GYLLING, Kai 33610 Tampere (FI) (74) Representative: Kangasmäki, Reijo Holger  Finnish Patent Consulting FPC Patenttikonsultointi Kangasmäki Oy PL 25 FIN-33401 Tampere FIN-33401 Tampere (FI)