entered the Kashagan consortium as a shareholder in 2005 and has since then doubled its stake to 16.81 per cent.
Kashagan and the neighbouring fields in the North Caspian Sea hold estimated reserves of 35 billion barrels of oil in place, with 9 billion to 13 billion barrels being recoverable.
Kazakh officials have said they expect the giant reservoir off western Kazakhstan to produce first oil later this month.
A multinational consortium developing the field has invested some $50 billion in about 13 years, making it the costliest oil project in the world.
During Kashagan's development, production will be gradually increased to 370,000 barrels per day in the second stage from 180,000 bpd in the first stage in 2013-14, according to North Caspian Operating Company (NCOC), which is developing the field.
Italy's ENI, US major ExxonMobil, Royal Dutch Shell and France's Total currently all hold 16.81 per cent stakes in Kashagan. Japan's Inpex owns 7.56 per cent.