By Nicole Friedman 

Plunging oil prices in the second half of 2014 upended global economic forecasts, boosted consumer spending and roiled markets from Moscow to Midland, Texas.

Now, analysts and investors--U.S. prices dropped from $107.26 a barrel in June to $53.27 a barrel as of Wednesday--are calling low prices the new normal.

Investors and traders say a price recovery likely won't come until the second half of 2015, as U.S. oil output keeps rising and subdued global growth weighs on demand. It will take months for the global glut of oil to shrink, market participants say. Producers will be slow to cut back on drilling, and consumers won't change their buying habits right away.

Analysts say prices could fall further as wintertime heating-oil demand recedes in the second quarter, and U.S. drivers will reap the benefits in the form of cheap gasoline. Bankers and investors are watching for a new wave of deal making in the energy industry, as weak and highly leveraged companies struggle to withstand low prices.

"We have yet to restore balance to this market," said David Martin, head of global oil strategy at J.P. Morgan Chase & Co. "One can reasonably expect that there's further price downside in the short term."

J.P. Morgan expects oil prices to bottom in the first quarter. For the year, the bank sees global benchmark Brent crude averaging $82 a barrel and U.S. prices averaging $77.25 a barrel.

This past year was expected by many to bring stable, triple-digit oil prices. Chevron Corp.'s chief executive declared in March that "the $100 barrel is the new $20," and traders complained that several years of low volatility had made it difficult to make money buying and selling oil.

Now, analysts and investors say the only certainty is volatility, as the global crude market adjusts to ample supplies and tepid global growth.

U.S. production has soared to its highest level since 1986 due to new technologies enabling producers to access oil trapped in shale-rock formations. U.S. imports of crude have fallen from a peak of 10.8 million barrels a day in June 2005 to just 7.5 million barrels a day in September. That leaves exporters competing to sell the barrels that used to go to the U.S. to other markets, mainly in Asia.

As an oil oversupply emerged this past summer, companies and analysts called for the Organization of the Petroleum Exporting Countries, a group of 12 oil-producing nations, to reduce its production to prevent prices from falling. At its November meeting, OPEC declined to do so, and prices sank in response.

For years, oil has been seen as less volatile than other commodity markets because of the presence of OPEC. Investors are now questioning whether the group has lost its power.

"OPEC basically just said, 'We can't do this collectively. We are no longer the dominant producer,'" said George Zivic, who manages the $384 million Oppenheimer Commodity Strategy Total Return Fund. "The previous 30-year regime in oil has changed."

Others disagree, and some analysts expect OPEC to call an emergency meeting to respond to low prices before its next scheduled gathering in June. "I think it's very much too early to write off OPEC," said Ian Taylor, chief executive of oil trader Vitol, at the Platts Global Energy Outlook Forum in December.

Without action from OPEC, individual companies or countries would need to produce less oil to cut back on the current oversupply, which is estimated by analysts to be as high as two million barrels a day.

But companies will reduce investment in drilling new wells before they shut existing ones, meaning it could take months for supply growth to slow. And as drilling has become more efficient, many shale-oil producers can still make money churning out crude at current prices.

On the demand side, low oil prices are expected to boost the struggling global economy. Consumers saving money on gas can spend more on other purchases. Drivers will especially benefit in the U.S., where low oil prices generally lead quickly to low gas prices, without currency fluctuations or fuel subsidies cutting into the reductions, as in some other countries.

But after years of high gas prices, consumers have become more efficient, and so have their vehicles. While demand is liable to perk up as oil prices stay low, that won't happen right away, analysts say, especially with the global economic growth subdued.

To be sure, a sudden change in supply due to a geopolitical event or OPEC decision could send prices higher. Barring that, most market watchers call for prices to recover somewhat in the second half of 2015 as supply and demand come into balance. But it could be years before traders buy and sell $100 barrels again, analysts say.

Of $60-a-barrel oil, said Vitol's Mr. Taylor, "we might have to live here for a much longer period than perhaps, at the moment, we are expecting."

Write to Nicole Friedman at nicole.friedman@wsj.com

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