By Christian Berthelsen And Georgi Kantchev 

Oil prices wavered between gains and losses Friday as fourth-quarter U.S. economic growth came in weaker than expected.

The domestic and international leading oil contracts had been in positive territory, but drifted lower after the Commerce Department reported that U.S. fourth-quarter gross domestic product grew 2.6%. The average estimate of economists surveyed by The Wall Street Journal was 3.2% growth.

The global Brent contract slipped 11 cents, or 0.2%, at $49.02 a barrel on the ICE Futures Europe exchange.

Light, sweet crude for March delivery gained 15 cents, or 0.4%, at $44.68 a barrel on the New York Mercantile Exchange.

Analysts said the small gains early in the session were likely the result of traders taking profits from bearish bets against the market given the end of the trading week and month. Traders buy contracts to close out bearish bets.

But with the global oil supply-demand picture unrelentingly weak and market sentiment bearish, the addition of a lower-than-expected GDP reading for the world's largest economy took away any buying motivation in the market.

"The market's really fighting a losing battle here," said Andy Lebow, a broker at investment bank Jefferies. "It's hard to trace a meaningful recovery in the next few months."

Oil futures have lost nearly 60% of their value since last June, as surging production from the U.S., Iraq and Libya have flooded the market at a time of weak demand growth as the global economy slows. The losses have stabilized somewhat in the last two weeks, but fundamental factors are expected to continue to deteriorate in coming months.

Indeed, market participants have been stunned by a pair of back-to-back U.S. inventory surges in domestic oil stockpiles in the last two weeks, with production reaching a new 31-year high.

"Crude oil is once again dead-cat bouncing," analyst Matt Smith of research consultancy Schneider Electric said in a note. "Meow."

Major oil companies have announced spending cuts in recent weeks to cope with the price rout. Chevron Corp. said Friday that asset sales and strength in its refining segment helped offset tumbling crude oil prices, resulting in better-than-expected results in its December quarter. Still, Chevron said it plans to pare its capital spending by 13% this year to $35 billion.

Royal Dutch Shell said Thursday it would curb its planned spending over the next three years by some $15 billion and scale back investments in shale. ConocoPhillips also said it would slash its capital budget as the company reported losses in the fourth quarter of last year.

Meanwhile, Saudi Arabian King Salman bin Abdulaziz has ordered major changes to his government, including a cabinet shuffle, but decided to keep veteran oil minister Ali al-Naimi in place.

Mr. Naimi, one of the most influential oil-price brokers in the global market, was the main strategist behind the November decision by the Organization of the Petroleum Exporting Countries to keep its oil output steady in a bid to protect the cartel's market share against booming U.S. shale production.

The price slump, however, is good news for the global economy, reducing gasoline prices at the pump and providing a boost to economic growth for net importers of oil. Barclays estimates that the halving in crude prices in the past six months, if sustained for the whole of 2015, would mean a transfer of $1.6 trillion from oil-producing to oil-consuming countries.

In refined products, February gasoline fell 1.22 cents, or 0.9%, to $1.3415 a gallon on the Nymex. February diesel fell 1.34 cents, or 0.8%, to $1.6050 a gallon.

Write to Georgi Kantchev at georgi.kantchev@wsj.com

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