Since Aug. 1, the companies have taken back 2.2 million barrels of oil of the 23 million barrels they agreed to store in the Strategic Petroleum Reserve, or SPR, from April through June.
Iraq said on Friday it would cut its oil output by a further 400,000 barrels per day in August and September to compensate for its overproduction in the past three months.
BP earlier this month cut its dividend for the first time in a decade after a record second-quarter loss, while Royal Dutch Shell in April cut its dividend for the first time since World War Two.
U.S. House Speaker Nancy Pelosi and Treasury Secretary Steven Mnuchin both said they were willing to restart talks on a deal to cover the rest of 2020.