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(11)

EP 2 049 618 A1

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(43) Date of publication: 22.04.2009 Bulletin 2009/17 (21) Application number: 07705101.9 (22) Date of filing: 01.02.2007

(51) International Patent Classification (IPC):  C10B 55/00(2006.01) C10G 9/00(2006.01) C10B 57/04(2006.01) (86) International application number: PCT/GB2007/000339 (87) International publication number: WO 2008/012484 (31.01.2008 Gazette 2008/05)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 28.07.2006 BR PI0603016 (71) Applicant: Petroleo Brasileiro S.A. Petrobras CEP-20031-912 Rio de Janeiro, RJ (BR)

(72) Inventors: SOARES, Gloria, Maria, Gomez CEP-22411-003 Rio de Janeiro, RJ (BR) GONCALVES, Natalie, Jorge CEP-20540-320 Rio de Janeiro, RJ (BR) NADOLNI, Aline, Voigt CEP-20521-050 Rio de Janeiro, RJ (BR) BARROS, Francisco, Carlos, Da Costa CEP-26013-350 Nova Brazil, RJ (BR) DE LUCENA, Sergio, Cunha CEP-20775-170 Rio de Janeiro, RJ (BR) DA COSTA, Sergio, Nunes CEP-24800-000 Itaboraf, RJ (BR) (74) Representative: Benson, John Everett  J.A. Kemp & Co. 14 South Square Gray's Inn GB-London WC1R 5JJ GB-London WC1R 5JJ (GB)