The comments by Iranian oil minister Bijan Namdar Zanganeh reflected Tehran's determination to regain its global role as an oil power as soon as it is freed of the sanctions under any nuclear deal with six world powers meant to ensure that it cannot make atomic weapons.
The Saudis produce about a third of OPEC's output now, and Zanganeh, in comments ahead of a meeting of OPEC's 12 oil ministers, said his country was determined to regain its share "under all circumstances."
Iran's agreement to limit its nuclear program is still only a preliminary one. Sanctions on its oil exports are likely to stay in place until a final deal is reached, which is unlikely before mid-2014. But the Iranian challenge reflected potential problems ahead for OPEC, unless the Saudis and others are prepared to cut back on their production and make room for a resurgent Iran.
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Saudi oil minister Ali Naimi sought to ease concerns, telling reporters he did not see a price war on the horizon.
"I hope Iran comes back (and) produces all it can," he said. But he gave no sign that his country was ready to reduce output, saying it remains "prepared to supply our customers with what they need."
Naimi and other oil ministers came to today's meeting saying the market is well balanced and expressing happiness with present prices. That means that ministers today will probably opt to keep the present OPEC output target at around 30 million barrels daily.
Zanganeh yesterday suggested oil sanctions may be incrementally relaxed even earlier than mid-2014. In a nod to the Saudis, he said he hoped OPEC members understand that "when a member country comes back ... They should open the doors for him and not fight with him."
Strong US shale oil production could add to internal OPEC pressures beyond political tensions caused by Sunni Saudi Arabia vying with Shiite-led Iran and Iraq.