Sinochem Group on Wednesday announced that it had entered into a deal with Angolan state-owned Sonangol to purchase crude oil for more than a decade.

The company declared this in a statement on its website. It however did not disclose further details including the supply amount or other financial details.

 According to a trading sources the deal was for four or five cargoes a month. This would make the China's state-run company one of the major holders of monthly contracts to purchase Angolan crude.

This deal comes as an achievement for Angola, as OPEC members struggle for market share, especially in China.

Present at the signing of the deal were the chairman of Sonangol, Angola's financial minister, Armando Manuel, and Zheng Zhijie, president of China Development Bank.

Last year, China decided to loan Sonangol the sum of $2 billion to enlarge oil and gas projects. Meanwhile in June, Angolan President Jose Eduardo dos Santos visited China to seek for a two-year suspension on debt settlements as well as support for a range of projects in the country, which includes a $4.5 billion hydropower scheme, Reuters reports.