Brent crude had dropped 7 cents to $45.39 per barrel by 0519 GMT, after settling down 71 cents at $45.46 in the previous session.
West Texas Intermediate (WTI) futures, the U.S. crude benchmark, fell 52 cents, or 1.21 percent, to $42.52 per barrel. They are up 5.3 percent so far this week, but have plunged 8.7 percent since the beginning of the month.
Profits earned by Chinese industrial companies fell 4.6 percent in October from a year earlier, data from the country's statistics bureau showed on Friday, declining for the fifth consecutive month.
ANZ said in a note on Friday that "U.S. stocks data did little to excite the market", referring to numbers from the Energy Information Administration on Wednesday which showed U.S. crude inventories rose 1 million barrels last week, slightly below analyst expectations.
The market is shifting its focus to a meeting of ministers from the Organization of the Petroleum Exporting Countries, which is set for Vienna on Dec. 4.
"Although we continue to believe that this would be a non-event, the willingness of Saudi Arabia to cooperate seems to be stronger this time around. Thus, the outcome of the meeting could be a surprising one," Daniel Ang at Phillip Capital said. Russian Energy Minister Alexander Novak said on Thursday that Russia and Saudi Arabia would set up a special joint working group on oil and gas cooperation to promote energy dialogue between the world's top oil producers.
Both Brent and U.S. crude have gained compared with last week's closes due to geopolitical risks in the Middle East after Turkey's shooting down of Russian warplane.
Russia threatened economic retaliation against Turkey on Thursday and said it was still awaiting a reasonable explanation, but Turkey dismissed the threats as "emotional" and "unfitting".
But some said Middle East geopolitical risk was unlikely to push oil prices higher.
"The well supplied crude market, record high inventories in OECD and lack of material threat to oil facilities in the Middle East from the military escalation against IS in Syria are going to prevent geopolitical premiums building in oil prices," BMI said in a note.
(Reporting by Meeyoung Cho; Editing by Richard Pullin and Joseph Radford; Editing by Stephen Coates)