By Devika Krishna Kumar
NEW YORK (Reuters) - U.S. oil prices recoiled 6 percent on Monday, slipping below the pivotal $30-a-barrel threshold in post-settlement trade, after news that Iraq's output reached a record last month returned attention to a market glut that sent prices to 12-year lows last week.
U.S. crude (CLc1) settled $1.85, or 5.8 percent lower at $30.34 a barrel.
The contract slipped to as low as $29.74 after the close. That was about 14 percent above Wednesday's $26.19 low, which was the cheapest price for U.S. futures since May 2003.
Brent crude (LCOc1), the global benchmark, settled down $1.68 at $30.50 a barrel, 5.2 percent below its closing price on Friday. It touched $30 after Monday's close but did not threaten to break back down towards Wednesday's 12-year low at $27.10.
The biggest two-day rally since 2008 on Thursday and Friday unwound some of what analysts called an "irrational" sell-off, which sent prices crashing below $30 for a total loss of more than 20 percent since the start of the year.
The 15-percent rebound came as traders raced to close out short positions and a monster blizzard moved towards the U.S. East Coast. It was nearly the largest ever two-day rally, while the renewed selling on Monday added to oil market volatility.
The new round of selling set off a round of frantic options activity, sending the oil volatility index (.OVX) more than 6 percent.
"Friday's advance was an overreaction to the storm," said Jim Ritterbusch of Chicago-based oil consultancy Ritterbusch & Associates.
Ritterbusch said the reversal on Monday comes as "the market is forced to refocus on various fundamentals that are set to become even more negative."
Iraq's oil ministry told Reuters on Monday that the country had record output in December, with its fields in the central and southern regions producing as much as 4.13 million barrels a day. A senior Iraqi oil official said separately the country may raise output even further this year.
"There's more oil coming into the market, and there's no reason to expect oil prices to go up," said James Williams, energy economist at WTRG Economics in London, Arkansas.
"If you look at the supply-demand situation, prices have not bottomed. We're probably going to go lower again through March in the absence of an OPEC meeting."
A preliminary Reuters survey showed on Monday that commercial crude oil and gasoline inventories probably rose last week, while distillate stocks likely fell.
Data from industry group the American Petroleum Institute is due on Tuesday at 4:30 p.m. EST.
Oil prices came under more selling pressure after Standard Chartered said it expects oil prices to remain volatile for the rest of the first quarter, noting "the underlying negative sentiment in the market seems little changed."
HSBC and UniCredit slashed their oil price forecasts for 2016 on Monday, joining several brokerages and banks that have also scaled back their outlooks.
The March Brent contract for expires Friday and options expire Tuesday, which analysts said means traders probably hedged their short options positions, adding to the selling pressure on Monday.
Yet, some, including Standard Chartered, expect oil prices to stabilise by the end of 2016.
OPEC's Secretary-General Abdullah al-Badri said at an event in London that signs were already emerging that the market was rebalancing.
Analysts at Energy Aspects said Monday that global oil inventories would continue to grow in the coming months, but should start to ease by mid-year.
(Additional reporting by Karolin Schaps in London, Meeyoung Cho in Seoul; Editing by Dale Hudson and Alden Bentley)