 Moodys Investors Service has assigned a A3 senior unsecured debt rating to the USD senior and unsecured notes to be issued by COSL Singapore Capital Ltd. and guaranteed by China Oilfield Services Limited COSL, A3 stable. The proposed notes will be used to refinance COSLs existing debt and for general corporate purposes. The A3 rating reflects the irrevocable and unconditional guarantee provided by COSL, and the fact that the notes will rank pari passu with COSLs other senior unsecured obligations, says Mike Zhu, a Moodys Assistant Vice President and Analyst. 