A final agreement has been signed between Iraq and China's CNOOC and state-run Turkish Petroleum Corp (TPAO) to develop the 2.5-billion-barrel Maysan oilfield complex, Reuters has reported. CNOOC will hold an 85% stake in the foreign companies' part of the venture, while TPAO will have 15%, officials said. An Iraqi state oil company will hold a 25% stake in the total partnership.