By Dana Mattioli, Liz Hoffman and Dana Cimilluca 

Halliburton Co. is in talks to buy Baker Hughes Inc., a deal that would help guard the big oil-field services companies against falling oil prices.

The talks are moving quickly and a deal could be forged soon, people familiar with the matter said. There is no guarantee the companies will reach an agreement, however, or that regulators would approve one if they did.

A purchase of Baker Hughes would likely be at a premium to the company's market value, which stood at just under $22 billion before The Wall Street Journal reported the talks Thursday afternoon. Baker Hughes shares were up around 25%, including after-hours trading, following the report. That gave the company a market value of about $26 billion. Halliburton's market value is about $48 billion.

Baker Hughes subsequently said it has "engaged in preliminary discussions with Halliburton."

Halliburton and Baker Hughes are the second- and third-largest oil-field services companies in the world by revenue, respectively, behind Schlumberger Ltd.

Such companies help energy producers, from Texas wildcatters to national oil companies, find and extract oil-and-gas deposits by selling equipment, renting tools, supplying labor and building worker camps in far-flung drilling fields. Oil-field services companies provide the drill bits that can be steered miles underground with precision, as well as fleets of trucks that pump fluids for hydraulic fracturing of shale rock--methods that have powered the U.S. drilling boom.

But the recent drop in oil prices threatens the services companies' business as it could make oil-and-gas production less profitable and spur clients to cut back on operations or demand better prices from their suppliers. Oil prices in recent months have dropped from over $100 a barrel to less than $80 amid global economic weakness and the surging U.S. supply.

Merging Halliburton and Baker Hughes, which have substantial overlap in operations, would lead to substantial cost savings helping the pair weather any further declines in oil prices. Oil-field services companies' shares rise and fall largely with the price of oil, and Halliburton's and Baker Hughes's stocks have dropped sharply since the beginning of summer. Shares of Baker Hughes closed 15% higher on Thursday, while Halliburton's shares rose 1%.

The exact motivations of the talks were unclear.

The Houston-based companies would have to win approval for any tie-up from global regulators--not a foregone conclusion, given the companies' market positions and because several countries where they operate have become more assertive in reviewing proposed deals in recent years.

A combined Halliburton and Baker Hughes would dominate several products in the global oil-field services market. Together, they control about half of the market for cementing, according to petroleum-services research firm Spears & Associates Inc. The process involves encasing wells in layers of cement to prevent leaks, such as the one at the Deepwater Horizon rig that exploded in the Gulf of Mexico in 2010. Improper cementing has been cited for groundwater pollution around U.S. shale wells.

"Literally, every product or service one of these companies offers, the other one offers," said Richard Spears, the research firm's vice president.

The U.S. market for fracking and other services might be sufficiently fragmented to ease antitrust concerns, he said. Halliburton and Baker Hughes have just 25% of the U.S. onshore fracking market, for example, and "would have no real pricing control," Mr. Spears said.

But the pair still would have to contend with scores of other global regulators. The companies operate in more than 80 countries--nearly everywhere that oil-and-gas drilling takes place.

Bill Herbert, an analyst with Houston investment bank Simmons & Co. International, said the deal would be "tenable" from an antitrust standpoint, though it would require Halliburton to sell a significant number assets across a range of business lines. "The industry needs consolidation," in part because of lower oil prices, he said.

Combined, Halliburton and Baker Hughes would still be significantly smaller than Schlumberger, which has a market value of about $125 billion.

Halliburton and Baker Hughes vie for slices of the huge sums energy producers spend on exploration and production--$682 billion this year alone, according to a Cowen & Co. estimate.

Baker Hughes was created in 1987 when Baker International merged with Hughes Tool, which was founded by the father of billionaire aviator, inventor and Hollywood tycoon Howard Hughes Jr. The company has about 61,000 employees and posted third-quarter sales of $6.25 billion, about half of which came from North America.

Halliburton was founded in 1919 and has more than 80,000 employees. The company got its start when founder Erle P. Halliburton borrowed a wagon, a team of mules and a pump, and started an oil-well cementing business.

The company, where Dick Cheney served as chief executive before he was vice president, has been looking at Baker Hughes for years, one of the people said. Halliburton's approach was unsolicited, the person said.

Halliburton in recent years has contended with fallout from its role in the Deepwater Horizon explosion and subsequent oil spill. Halliburton was a contractor on the rig for BP PLC and agreed in September to pay $1.1 billion to Gulf Coast residents, businesses and local governments.

A combination of the two companies would be one of the largest energy mergers in recent years. There have been just 11 energy deals above $20 billion globally since 1995, according to Dealogic.

The marriage also would come as the mergers-and-acquisitions market has been robust. Global M&A volume has reached $2.9 trillion so far this year, up 28% from the same period last year, according to Dealogic.

Ryan Dezember and Alison Sider contributed to this article.

Write to Dana Mattioli at dana.mattioli@wsj.com, Liz Hoffman at liz.hoffman@wsj.com and Dana Cimilluca at dana.cimilluca@wsj.com

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