Oil prices dropped to six-week lows on Thursday, under pressure from high global inventories and doubts about OPEC's ability to implement agreed production cuts.
Brent crude oil hit a session low of $46.70 a barrel, its weakest since May 5 and just above six-month lows, before recovering a little ground to trade at $46.90, down 10 cents, by 2:36 p.m. ET (1836 GMT).
U.S. light crude fell to a six-week low of $44.32. It ended Thursday's session 27 cents lower at $44.46, the lowest settle since Nov. 14.
Both crude oil benchmarks have lost all the gains made at the end of last year after the Organization of the Petroleum Exporting Countries agreed with other big producers to cut output in an effort to prop up prices.