BEIJING (AFX-ASIA) – Standard & Poor’s said it has initiated coverage of China Oilfield Services Ltd (HK 2883) (COSL) with an “accumulate” rating at a price target of HK$2.74, representing a potential upside of 13%. (US$1=HK$7.76). The ratings agency said in a research note that COSL is China’s leading oil services provider to the country’s…