Oil edged higher in volatile trade on Friday, and was flat on the week, with prices supported by the prospect of lower Russian exports but pressured by rising inventories in the United States and concerns over global economic activity.

Brent crude futures settled at $83.16 a barrel, up 95 cents, or 1.2 per cent. West Texas Intermediate US crude futures (WTI) settled at $76.32 a barrel, rising 93 cents, or 1.2 per cent. Earlier, both fell by more than $1 a barrel.

The benchmarks were little changed on the week.

Lower trading volumes contributed to volatility, with Brent trading at 58 per cent and WTI trading at 90 per cent of the previous session's levels.

On the anniversary of Russia's invasion of Ukraine, benchmark Brent crude was about 15 per cent lower than a year earlier. It hit a 14-year high of nearly $128 a barrel on Mar. 8, 2022.

Both benchmarks rose about 2 per cent in the previous session on Russia's plans to cut oil exports from its western ports by up to 25 per cent in March, which exceeded its announced production cuts of 500,000 barrels per day.

But the market appeared to be well supplied with US inventories at their highest since May 2021, according to data from the US Energy Information Administration.

An indicator of future supply, US oil rigs fell seven to 600 this week, while the total count was still up 103 rigs, or 15.8 per cent, over this time last year, energy services firm Baker Hughes Co (BKR.O) said.

Indications that Russian crude and refined products are accumulating on tankers floating at sea also hinted at increasing supplies.

JP Morgan said in a note that it thinks short-term prices are more likely to drift lower toward the $70s than rise "as global growth headwinds strengthen and excess 'dark' inventory exacerbated by a flooding of Russian oil is worked off".

The bank also said it expects the Organization of the Petroleum Exporting Countries (OPEC) to cut production to limit oil price declines.

Minutes of the latest US Federal Reserve meeting indicated that a majority of officials remained hawkish on inflation and tight labour market conditions, signalling further monetary tightening.

The prospect of further interest rate hikes supported the dollar index , which was set for a fourth straight week of gains. The index is now up about 2.5 per cent for the month.

"While... curtailed Russian supply are certainly formidable bullish considerations, price action across the complex this month has sent off a powerful message that rising US interest rates that were further reinforced by Fed minutes, will be a major impediment to sustainable oil price strength," said Jim Ritterbusch of consultancy Ritterbusch and associates..

A firm dollar makes commodities priced in the greenback more expensive for holders of other currencies.