U.S. oil prices settled lower on Friday, after global oversupply and a bleak demand outlook made it hard to guess the market's bottom.
Over the past four days, futures of global benchmark Brent and U.S. West Texas Intermediate (WTI) crude slid sharply, hitting 12-year lows, after China's stock market plunge this week roiled global markets.
Brent was down 24 cents at $33.51 a barrel. It hit a session low of $32.78, after sliding on Thursday to $32.16, the lowest since April 2004.
U.S. West Texas Intermediate (WTI) settled down 0.33 percent, or 11 cents, at $33.16 a barrel, down about 10 percent for the week. It fell to a session low of $32.64, after hitting $32.10 a day ago, the lowest since December 2013.