By Aaron Sheldrick and Henning Gloystein
U.S. West Texas Intermediate (WTI) crude futures were at $68.87 per barrel at 0647 GMT, down 9 cents from their last settlement.
Brent crude futures were at $73.40 per barrel, down 5 cents from their last close.
Overall U.S. crude oil inventories actually rose by 3.8 million barrels last week to 408.74 million barrels, according to data from the Energy Information Administration (EIA), however stocks at the key Cushing storage hub in Oklahoma fell by 1.3 million barrels, the EIA data showed.
"Hedges (are) thought to be a factor in oil prices being well bid," said Stephen Innes, head of trading for Asia-Pacific at futures brokerage OANDA in Singapore.
"There's increasing chatter about ... Cushing inventories (being) down ... This primary U.S. oil hub's inventory now sits at the lowest levels since 2014," he said.
ANZ bank said on Friday in a note the drop in Cushing inventories were a driver for rising crude oil prices "amid signs that last week's (overall) build in inventories won't last very long."
Even with last week's rise, overall U.S. crude inventories are below the 5-year average of around 420 million barrels.
BEARISH FACTORS
There were also factors holding oil markets in check.
WTI is heading for a roughly flat week after four weekly falls, while Brent is on track to post a fourth week of declines in five, set for a drop of 1.4 percent.
Analysts said the outlook beyond the short-term was turning bearish.
"Bulls are fighting a losing battle ... Brent oil may fall to $67 per barrel," said Reuters technical commodities analyst Wang Tao.
Russian oil output rose by 150,000 barrels per day (bpd) in July from a month earlier, to 11.21 million bpd, energy ministry data showed on Thursday.
Output by top exporter Saudi Arabia has also risen recently, to around 11 million bpd, and U.S. production is around that level as well.
Reacting to rising supplies, Saudi Aramco cut its September price for its Arab Light grade for Asian customers by $0.70 a barrel versus August to a premium of $1.20 a barrel to the Oman/Dubai average, it said on Thursday.
Saudi Arabia, Russia, Kuwait and the United Arab Emirates have increased production to help to compensate for an anticipated shortfall in Iranian crude supplies once planned U.S. sanctions take effect later this year.
But a complete halt to Iranian supplies looks unlikely with Bloomberg reporting on Friday that China, Iran's biggest customer, has rejected a U.S. request to cut imports from the OPEC member.
(Reporting by Aaron Sheldrick in TOKYO and Henning Gloystein in SINGAPORE; Editing by Richard Pullin and Tom Hogue)
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)