LONDON (Reuters) -- Kazakh President Nursultan Nazarbayev has summoned the heads of the six foreign oil companies that control the Kashagan oilfield to a meeting on Jan. 11, the Wall Street Journal reported on Monday.

The newspaper said it had seen a letter sent to the partners, inviting them to a meeting with Nazarbayev and Prime Minister Karim Masimov at which the deadlock over the field may be broken.
The government is seeking compensation for delays and cost overruns which threaten to cut the state's take of project revenues.
The Kashagan project is led by Italian oil major Eni. The other foreign investors are France's Total, Royal Dutch Shell Plc., Japan's Inpex, and U.S. oil companies Exxon Mobil Corp. and ConocoPhilips Corp.
No one was available for comment at Eni. Shell and Total declined to comment.