(19)

(11)

EP 2 561 041 A2

(12)

(88) Date of publication A3: 18.05.2012 (43) Date of publication: 27.02.2013 Bulletin 2013/09 (21) Application number: 11724448.3 (22) Date of filing: 18.04.2011

(51) International Patent Classification (IPC):  C10G 1/00(2006.01) C10G 9/40(2006.01) F24J 2/00(2006.01) C10G 9/00(2006.01) E21B 43/24(2006.01) (86) International application number: PCT/IB2011/000854 (87) International publication number: WO 2011/132056 (27.10.2011 Gazette 2011/43)

(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 (30) Priority: 19.04.2010 IT MI20100660 (71) Applicant: ENI S.p.A. 00144 Rome (IT)	(72) Inventors: BORTOLO, Rossella I-28100 Novara (IT) RICCO' , Moreno I-20051 Limbiate (MB) (IT) (74) Representative: Bottero, Carlo et al Barzanò & Zanardo Milano S.p.A. Via Borgonuovo, 10 20121 Milano 20121 Milano (IT)