Oil extended gains Wednesday as signs of declining U.S. stockpiles pointed to healthy demand while investors weighed potential disruptions to supply because of global geopolitical tensions.

Futures in New York rose as much as 0.6 percent after adding 2.5 percent in the past three sessions. An industry report showed U.S. inventories fell last week, with government data Wednesday forecast to show a fourth straight drop. Crude’s recent gains have been driven by fighting between the Iraqi government and Kurdish forces in the oil-rich Kirkuk region, which could stoke tensions beyond the country’s borders.

Iraq is just one of the oil market’s geopolitical risks, with uncertainty also growing over tensions between Iran and the U.S., Goldman Sachs Group Inc. said Tuesday. Iraq said it would support an extension of OPEC output cuts to the end of 2018 and insisted its production plans won’t be disrupted by U.S. President Donald Trump’s disavowal of the nuclear deal that’s boosted its exports.

"With Iraq and the Kurds, the effect of geopolitical risks on oil production is starting to be priced in again," said Hans Van Cleef, senior energy economist at ABN Amro, quoted by Bloomberg. "That’s one of the reasons we think that oil prices can go up further. The inventory data is coming up later today -- that will be another driver. After the hurricane I think there is a good chance that there is a bullish report, and that is starting to be priced in."

West Texas Intermediate crude for November delivery rose as much as 29 cents to US$52.17 a barrel on the New York Mercantile Exchange and was trading at $52.07 as of 9:43 a.m. in London. Total volume traded was about 35 percent below the 100-day average. Prices on Tuesday added 1 cent to close at $51.88, the highest since Sept. 27.

Brent for December settlement rose as much as 50 cents, or 0.9 percent, to $58.38 a barrel on the London-based ICE Futures Europe exchange. The global benchmark crude traded at a premium of $5.99 to WTI for December.

U.S. inventories fell by 7.13 million barrels last week, the American Petroleum Institute was said to report. Data from the Energy Information Administration Wednesday is forecast to show a 3.25 million-barrel slide.