CEO [CNOOC] 424B2: (Original Filing)
[PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED April 27, 2015 CNOOC FINANCE (2015) AUSTRALIA PTY LTD Australian Company Number 604 822 335 (incorporated in Victoria, Australia) US$1,500,000,000 2.625% Guaranteed Notes due 2020 US$300,000,000 4.200% Guaranteed Notes due 2045 unconditionally and irrevocably guaranteed by CNOOC Limited (incorporated with limited liability in Hong Kong) and CNOOC FINANCE (2015) U.S.A. LLC (formed in the State]