International Brent crude oil futures LCOc1 were at $75.63 per barrel at 0654 GMT, down 19 cents from their last close.
U.S. West Texas Intermediate (WTI) crude futures CLc1 were down 30 cents at $68.42 a barrel.
Trading activity was limited due to a public holiday in Britain, traders said.
“Falling U.S. rig counts and last week’s decline in U.S. inventories are supporting oil prices amid a protracted U.S.-China trade war that could dampen global growth and weigh on oil demand,” said Stephen Innes, Head of Trading for Asia-Pacific at futures brokerage OANDA in Singapore.
U.S. energy companies cut nine oil drilling rigs last week, dropping to 860, the biggest reduction since May 2016, energy services firm Baker Hughes said on Friday.
“Despite growing concerns about potential oversupply, the markets will continue to get a fillip from U.S. sanctions against Iran,” Innes added.
Washington will target Iran’s oil exports with sanctions from November.
OPEC-member Iran has exported around 2.5 million barrels per day of crude oil so far this year. Most analysts expect this figure to fall by at least 1 million bpd once sanctions kick in.
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