Petrochina has floated the tender for the improvement of its phase 1 crude processing facility (CPF1) at the Halfaya oil field in southeast Iraq.

Interested contractors have until 6 July to submit proposals for the engineering, procurement, construction and commissioning (EPCC) contract, which was tendered on 5 June.

Petrochina gave no further details on the scope of the work.

The Chinese state-owned firm plans to develop the field in three phases to reach a production capacity of more than 535,000 barrels a day (b/d) by the end of 2017.

Phase 1 took capacity up to 100,000 b/d and was completed in June 2012. Phase 2 is under construction by China Petroleum Engineering & Construction Corporation.

The phase 3 facilities are still being designed by the UK’s Mott MacDonald. These will include new well pad clusters, an oil-gathering system, a third CPF and storage tanks.

The Halfaya consortium includes Petrochina’s parent group China National Petroleum Corporation (CNPC), Malaysia’s Petronas, France’s Total and state-owned Missan Oil Company.