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Oil futures fell in Asian trade on Friday as a record build in US crude stocks stoked concerns about global oversupply, outweighing moves by oil producers including Saudi Arabia and Russia to cap oil output.
US crude inventories rose by 2.1 million barrels last week, to a peak of 504.1 million barrels, the third week of record highs in the past month, data from the US government's Energy Information Administration (EIA) showed on Thursday.
That came as Iraq's oil minister Adel Abdul Mahdi said on Thursday that talks would continue between OPEC and non-OPEC members to find ways to restore "normal" oil prices following a meeting on Wednesday.
"The market is expecting continuing inventory builds," said Tony Nunan, oil risk manager at Japan's Mitsubishi Corp in Tokyo.
"Key to any deal (to cap production) is Iran. But Iran has been clear, saying it wants to get back to its pre-sanctions (production) level," Nunan added.
"Everything is pointing to the end of this year (before there is an agreement) when Iran gets to 4 million barrels per day. By that time the pain will be so great everybody will come to the table (to agree output caps)," Nunan said.
A combination of increased global oil demand of between 1-2 million barrels per day, production cutbacks by non-OPEC members and the deal by producers to cap output could lead oil prices to climb to around $40 a barrel by year-end, Nunan said.
Brent futures had fallen 42 cents to $33.86 a barrel as of 0153 GMT, after ending the previous session down 22 cents.
US crude had slipped 31 cents to $30.46 a barrel, after settling up 11 cents the session before.
Oil prices rose more than 14% in the three days to Thursday after Saudi Arabia and Russia, supported by other producers including Venezuela and Iraq, moved to freeze oil output at January's levels. Iran endorsed the plan without commitment on Wednesday,
If approved, it would be the first such deal in 15 years between the Organization of the Petroleum Exporting Countries and non-OPEC members.
Moves to curb output growth come as Saudi Arabia's crude oil exports fell by more than 200,000 barrels per day (bpd) to almost 7.49 million bpd in December compared with the previous month, official data showed on Thursday.
"The agreement has value in restricting major producers from adding incremental barrels to a saturated marketplace. However, it does little to correct the existing imbalance between global crude supply and demand," said BMI Research in a note on Friday.
China's crude oil and liquids production is set to decrease at an average rate of 1.8% over the next two years as sustained weakness in oil prices prompt the country's largest producers to reduce upstream spending and disengage from high-production, BMI said in a separate note on Friday.
