By Brian Spegele 

BEIJING--When oil prices surged near record highs in recent years, China's state-owned energy companies bet prices could climb even higher, paying top dollar for assets around the world and pushing aggressively to develop new resources at home.

Now, as oil prices have lost around half their value in less than a year, China's biggest energy companies are in the midst of a rare pull back.

Cnooc Ltd.--the listed arm of China's main state-owned offshore oil-and-gas producer--said Tuesday it planned to cut capital spending by 26% to 35% in 2015 compared with a year earlier, its first such drop since 2010.

The company could be facing write-downs of more than $5 billion related to its 2013 acquisition of Canada's Nexen Inc., according to J.P. Morgan. Cnooc said its integration with Nexen was proceeding as planned but declined to comment on the estimate.

Rival China National Petroleum Corp., the nation's biggest oil-and-gas producer, is pledging "revolutionary measures" to cut costs. Meanwhile, a joint venture between Sinopec, another big Chinese oil company, and Canada's Talisman Energy Inc. is laying off several hundred staff and contractors in the U.K., and Sinopec says it wants to develop 3-D printing and clean-energy technology to diversify its business.

Oil companies in China emerged as some of the world's biggest energy deal makers over the past decade. Chinese companies have bought more than $100 billion in oil-and-gas assets since 2011, according to data provider Dealogic. But today, the promise of Chinese money isn't guaranteed.

"At least in the near term, oil- and gas-rich countries that used to count on Chinese investment will have to look elsewhere for investment once oil prices rebound," said Bo Kong, an expert on China's state-owned energy companies at the University of Oklahoma.

China's cuts come as others in the region are also pulling back. Malaysia's Petroliam Nasional Bhd., known as Petronas, has warned of double-digit cuts in capital spending this year. Indonesia's Pertamina said it might cut its investment by up to 50% this year.

The chairman of Sinopec, Fu Chengyu, has in recent years built a reputation for himself as an aggressive overseas deal maker. But when Mr. Fu addressed top Sinopec brass earlier last month, he struck a more sober tone. The company "must recognize the new normal," Mr. Fu told company leaders, invoking a new Communist Party mantra meaning slower economic growth is ahead. Sinopec said the meeting allowed executives to understand the "grim circumstances" facing the company.

Much of the Chinese oil industry began paring back last year before oil prices plunged, the result of an anticorruption campaign that helped put a stop to Chinese deal making. But lower prices are adding pressure on China's oil companies to hold off on spending.

Such challenges for China's state oil companies "will only become more serious as the low prices continue," said Kang Wu, vice chairman for Asia at FACTS Global Energy, a consultancy. China's oil companies now have greater exposure to global price swings due to their international footprints, while depleting fields at home mean rising production costs. "They are bracing for a year that is likely to be tough," he said.

Lower oil prices have already hurt these companies. Cnooc's third-quarter revenue fell 4.6% year-over-year while net profit at PetroChina declined to 27.9 billion yuan from 29.8 billion yuan a year earlier.

After years of spending increases, PetroChina has been slashing expenditures to support profits. That is partly because global oversupply means the challenge of satisfying China's growing energy needs is less acute than before.

In January, Zhou Jiping, chairman of PetroChina parent CNPC, promised "revolutionary measures" to cut costs. J.P. Morgan forecasts capital spending at PetroChina will fall 7% to 270 billion yuan ($43.2 billion) this year, its lowest since 2009.

PetroChina said in a statement it had stepped up control of its spending, and "shifted its focus from scale expansion to the quality and profitability of its investments."

The pullback in part reflects China's slowing growth. China's GDP grew 7.4% last year, its slowest pace of growth in a quarter-century. The International Energy Agency forecasts demand for oil products such as gasoline and diesel in China will grow 2.5% in 2015, down from 2.7% a year earlier.

Despite the challenges, China's oil companies will continue to grow, reflecting the forward march of China's economy and its increasing energy needs. Depressed prices are hurting oil companies globally, and the industry is watching whether Chinese companies will make timely acquisitions.

Chinese companies have been active investors abroad in recent years, but their contributions to global oil supplies remain modest compared with big producers like the U.S. and Saudi Arabia. As a result, Chinese companies' moves might have little impact on easing the gap between global supplies and demand, said Mr. Kong, the University of Oklahoma professor.

A spending binge when oil prices were high means China's oil companies face added pressure to digest new assets. For the past two years, Cnooc and its chairman, Wang Yilin, were celebrated in China for the company's acquisition of Canadian oil producer Nexen. The $15.1 billion deal marked China's biggest overseas energy acquisition to date.

Today, Nexen and other overseas assets acquired during the past five years are emerging as heavy weights for Cnooc, especially as oil prices have plunged. J.P. Morgan says Cnooc could be facing more than $5 billion in write-downs related to its Nexen portfolio.

Cnooc said in a statement Tuesday that despite sharp capital spending cuts, it would still meet oil-production growth targets through "cost control and efficiency enhancement." The company said it aimed to produce 475 million barrels to 495 million barrels of oil equivalent in 2015, up from an estimated net production 432 million barrels of oil equivalent last year.

Write to Brian Spegele at brian.spegele@wsj.com

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