(19)

(11)

EP 2 737 271 A1

(12)

(43) Date of publication: 04.06.2014 Bulletin 2014/23 (21) Application number: 12743709.3 (22) Date of filing: 25.07.2012

(51) International Patent Classification (IPC):  F28D 7/00(2006.01) E21B 36/04(2006.01) F28D 7/02(2006.01) E21B 36/00(2006.01) E21B 43/34(2006.01) (86) International application number: PCT/EP2012/064614 (87) International publication number: WO 2013/014197 (31.01.2013 Gazette 2013/05)

(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 (30) Priority: 28.07.2011 IT CO20110030 (71) Applicant: Nuovo Pignone S.p.A. 50127 Florence (IT)	(72) Inventor: GALASSO, Valentino I-FI 50127 Florence (IT) (74) Representative: Illingworth-Law, William Illingworth  GE International Inc. Global Patent Operation - Europe 15 John Adam Street London WC2N 6LU London WC2N 6LU (GB)