Qatar Petroleum invited international oil and gas companies to compete for the operation and development of its offshore al-Shaheen reservoir, its biggest oil field.

Maersk Oil Qatar, a unit of Copenhagen-based AP Moeller- Maersk A/S and the current operator, was among companies invited to make bids, state-owned Qatar Petroleum said in an e-mailed statement Wednesday. The new contract begins in mid-2017. Other companies invited weren’t identified.

Qatar Petroleum is cutting costs, consolidating operations and evaluating production sharing agreements as part of a restructuring plan that will be completed in July, Nasser al- Jaidah, chief executive officer of Qatar Petroleum International, QP’s foreign investment arm, told reporters in Doha on Wednesday.

Al-Shaheen currently produces about 300,000 barrels of oil a day, Qatar Petroleum said in the statement. Qatar produced 700,000 barrels of oil a day in April, according to data compiled by Bloomberg. The country is the world’s biggest exporter of liquefied natural gas.