Petrochina, the developer of the Halfaya oil field has issued a tender for the provision of maintenance services for its pipelines in the southeast of Iraq.

The state-owned Chinese firm has set a deadline of 16 May for technical and commercial proposals.

The three-year contract covers more than 40 existing and planned pipelines with sizes ranging from less than an inch in diameter to a 42-inch proposed export trunk line. Work will include excavation to identify corrosion or damage and then the repair or replacement of the pipelines.

Petrochina, a subsidiary of state-owned China National Petroleum Corporation (CNPC), leads the development of the 4.1-billion-barrel Halfaya oil field along with France’s Total, Malaysia’s Petronas and Iraq’s Missan Oil Company.