CEO [CNOOC] FWP: (Original Filing)
[No. 333-224357 Registration No. 333-224357-01 Registration Issuer Free Writing Prospectus dated April 25, 2018 Relating to Preliminary Prospectus Supplement dated April 20, 2018 CNOOC LIMITED Pricing Term Sheet 4.375% Notes due 2028 (the 2028 Notes) Issuer: CNOOC Finance (2015) U.S.A. LLC Guaranto]