By Stephanie Kelly and Marcy de Luna

NEW YORK (Reuters) -Oil prices surged to seven-year highs on Friday, extending their rally into a seventh week on ongoing worries about supply disruptions fueled by frigid U.S. weather and ongoing political turmoil among major world producers.

Brent crude rose $2.16, or 2.4%, to settle at $93.27 a barrel having earlier touched its highest since October 2014 at $93.70.

U.S. West Texas Intermediate crude ended $2.04, or 2.3%, higher at $92.31 a barrel after trading as high as $93.17, its highest since September 2014.

Brent ended the week 3.6% higher, while WTI posted a 6.3% rise in their longest rally since October.

The market’s surge accelerated in the last two days as buyers piled into crude contracts due to expectations that world suppliers will continue to struggle to meet demand.

U.S. jobs figures were surprisingly strong in January, despite the presence of the Omicron variant of the coronavirus.

Crude prices, which have already rallied about 20% so far this year, are likely to surpass $100 per barrel due to strong global demand, market strategists said this week.

Reflecting that bullish view, money managers raised their net long U.S. crude futures and options positions in the week to Feb. 1 by 6,616 contracts to 304,013, the U.S. Commodity Futures Trading Commission (CFTC) said.

Some, however, see risks to the rally. Citi Research said it expects the oil market to flip into surplus as soon as the next quarter, putting the brakes on the rally.

“A spike towards $100 crude should not be ruled out in the short run, but downside risks are plentiful, including Omicron setbacks on demand, economic growth concerns and financial market corrections as the central banks fight inflation,” said Bjørnar Tonhaugen, Rystad Energy’s head of oil markets.

Winter storms bringing icy conditions in the United States, particularly in Texas, also fueled supply fears as extreme cold could cause production to shut temporarily, similar to what happened in the state a year ago.

Tight oil supplies pushed the six-month market structure for WTI into steep backwardation of $9.06 a barrel on Friday, its widest since September 2013.

Backwardation exists when contracts for near-term delivery are priced higher than those for later months – and is reflective of near-term demand that encourages traders to release oil from storage to sell it promptly.

The number of U.S. oil rigs, an early indicator of future output, rose two to 497 this week, its highest since April 2020, energy services firm Baker Hughes Co said. [RIG/U]

Even though the oil rig count has climbed for a record 17 months in a row, the weekly increases have mostly been in single digits and production is still far from pre-pandemic record highs as many companies focus more on returning money to investors rather than boosting output.

Oil markets have also gained support from geopolitical risks as major oil producer Russia has amassed thousands of troops on Ukraine’s border, and is accusing the United States and its allies of fanning tensions.

The Organization of the Petroleum Exporting Countries and allies led by Russia, together known as OPEC+, agreed this week to stick to moderate output increases, with the group already struggling to meet existing targets and despite pressure from top consumers to raise production more quickly.

Iraq, OPEC’s second-largest oil producer, pumped well below its OPEC+ quota in January, while OPEC+ member Kazakhstan wants to keep more of its oil output at home to tackle rising fuel prices.

(Reporting by Stephanie Kelly in New York and Marcy de Luna in Houston; additional reporting by Rowena Edwards in London and Roslan Khasawneh in SingaporeEditing by David Goodman and Marguerita Choy)

---