- Oil prices eased on Thursday after posting more multi-year highs earlier in the session.
- Traders adjusted to the prospects of renewed U.S. sanctions against Iran amid an already tightening market.
- In China, which is Iran's single biggest buyer of oil, Shanghai crude futures posted their biggest intra-day rally since their launch in March.
Crude prices stabilized on Thursday, giving up early gains as investors took profit on a rally triggered by potential disruption to oil flows from major exporter Iran in the face of U.S. sanctions.
Losses, however, were limited as the market contended with concerns about Venezuela's crude production slipping further and with bullish drawdowns in U.S. crude inventories.
U.S. West Texas Intermediate (WTI) crude futures ended Thursday's session up 22 cents at $71.36 a barrel.
Brent crude futures, the international benchmark for oil prices, were up 19 cents at $77.40 a barrel by 2:28 p.m. ET.
The United States said on Tuesday that it plans to impose new sanctions against Iran after abandoning an agreement reached in late 2015 that curbed Tehran's nuclear activities in exchange for removal of U.S. and European sanctions.
"As we digest the news of the withdrawal from the Nuclear Accord, I think it's beginning to set in that there's a six-month lag before things begin to effect supply," said Gene McGillian, Vice President of research at Tradition Energy. "Overall the market still looks poised for higher levels."
U.S. crude inventories continue to lend support to the market, McGillian said. The U.S. Energy Information Administration reported a larger-than-expected draw on Wednesday.
Brent crude could return to $100 a barrel next year, or even sooner, Bank of America said, due to the ongoing collapse of Venezuelan output and risks to Iranian crude exports. The bank also lifted its average Brent forecast to $70 for this year and $75 in 2019.
Oil prices were still on track for their fourth consecutive quarterly gain, the longest such stretch for more than 10 years, boosted largely in the past month by fears of disruption in supplies from Iran, which pumps about 4 percent of the world's oil and exports about 450,000 barrels per day (bpd) to Europe and around 1.8 million bpd to Asia. Sales to Europe are seen by analysts as the more likely to be reduced by the sanctions.
Analysts had little hope that opposition to the U.S. action would prevent sanctions from going ahead.
European allies have said they remain committed to maintaining the nuclear deal, with German Chancellor Merkel reiterating her support of the accord Thursday.
"Europe and China will not fight against the U.S. sanctions. They will grumble and accept it. There is no one who will realistically choose Iran over the U.S.," said energy consultancy FGE.
"We believe the previous 1 million-bpd limit for exports (imposed during previous sanctions) will be reimposed. As before, it may take several rounds of reductions to reach target levels," FGE's founder and chairman Fereidun Fesharaki wrote in a note.
The estimate is on the high end. Many analysts believe fewer than 500,000 barrels a day of Iranian crude will come off the market.
Even without disruption to Iran's crude flows, the balance between supply and demand in the oil market has been tightening steadily, especially in Asia, with top exporter Saudi Arabia and No.1 producer Russia having led efforts since 2017 to cap output to prop up prices.
Saudi Arabia is ready to offset any supply shortage but it will not act alone to fill the gap, an OPEC source familiar with the kingdom's oil thinking said on Wednesday.
The Organization of the Petroleum Exporting Countries, however, is in no hurry to decide whether to pump more oil to make up for an expected drop in exports from Iran, four sources familiar with the issue said, saying any loss in supply would take time.
"What the full impact on Iranian flows will be is still difficult to estimate," said Petromatrix strategist Olivier Jakob.
"One thing that has changed and which I think is clearly a new development is that it seems to me that the White House administration has really pushed Saudi Arabia to do something about price and to put supply back into the market to make sure prices do not run up ... before (when sanctions were last in place) Saudi Arabia was driving its own oil policy."
One factor that could partially mitigate any shortfall from Iran is soaring U.S. oil output.
The EIA on Tuesday raised its forecast for U.S. output in its monthly report to 12 million bpd late next year. The agency has raised its forecasts every month since last August.
This would make the United States the world's largest producer, ahead of both Russia and Saudi Arabia.
— CNBC's Tom DiChristopher contributed to this story.