The US military has awarded seven new contracts for supplying oil to Iraq, to replace a controversial deal with Vice-President Dick Cheney's former firm.
Halliburton, once led by Mr Cheney, is being probed for allegedly overcharging on oil brought in from Kuwait.
All seven new contracts rely on supplies from Turkey.
Six of the new deals, worth in total $200m, are with Turkish firms, with a seventh - the largest at $108.5m - going to a Texas-based operation.
The need for the new arrangements followed allegations that Halliburton was charging the US three times what the oil had cost Kuwait.
An investigation is under way there to see who may have been responsible, as well as a criminal investigation by the Pentagon.
Refinery Associates: $108.5m for petrol and diesel
Turcas Petrol: $59m for petrol and diesel
Opet Petrolcul: $55m for petrol
Petrol Ofisi: $35m for diesel
Delta Petrol Urunleri Ticaret: $18m for LPG
Iprgaz: $17m for LPG
Tefirom: $15.8m for LPG
(All Turkish except Refinery Associates, which is based in Texas. 22 companies bid for the deals.)
Halliburton has made billions of dollars from other Iraq contracts, many awarded without competitive bidding.
Those deals could now be subject to a detailed examination as well, the firm says.
The Pentagon's Defense Contract Audit Agency has criticised "deficiencies" in construction and engineering work done in Iraq by the firm's Kellogg Brown & Root (KBR) subsidiary.
The audit could result in refunds or other financial penalties, Halliburton said in a regulatory filing.
Among accusations the firm has faced is one of charging the US military for three times too many meals served to troops, while two staff have been dismissed for taking $6m bribes.