By CLIFFORD KRAUSS FEB. 12, 2014

HOUSTON — T. Boone Pickens has personified the nation’s oil industry for more than a generation. So when he made an offhand comment at a conference here a few weeks ago expressing reservations about lifting the nation’s ban on exports of crude oil, he startled some of his old allies in the business.

Scott Sheffield, chief executive of Pioneer Natural Resources and one of the top oil executives in the state, picked up the phone to have a chat. “We had lunch and he made sense,” said Mr. Pickens, who has since revised his position.

Chalk one up for the oil producers, who have begun lobbying the Obama administration, Congress and the public to let them export the bounty of crude oil flowing out of new shale fields across the country.

Opposing them are their erstwhile cousins, the independent refiners, who insist that they need abundant, economical domestic supplies of oil so they can compete with foreign refiners.

It is a rare clash in a deeply guarded industry that involves arguments over national security, pricing at the pump and, after all is said and done, who will get a bigger share of earnings from the current drilling rush.

“What we have here is a food fight for the profits that will come either from exports of crude oil or exports of refined products,” said Amy Myers Jaffe, executive director of energy and sustainability at the University of California, Davis, who testified before Congress recently in favor of lifting the ban. “It’s like an argument inside a family business but one that could result in huge market distortions that can either hurt the consumer or our national security.”

Producers like Mr. Sheffield warn that a mounting glut of certain grades of oil in some regions of the country will eventually force a halt to unprofitable drilling if exports are not allowed.

“Nobody wants the collapse of the oil industry,” Mr. Sheffield said in an interview. “You would be importing crude oil from the Middle East all over again.”

On the other side of the debate are some of the nation’s biggest refiners, who argue against unlimited exports of crude oil even as they export increasing amounts of refined products like diesel and gasoline. To their way of thinking, the oil producers are merely trying to increase their profits at the expense of American consumers.

“They are seeking the highest price available,” Bill Day, a vice president at the Valero Energy Corporation, a large independent refiner, said of the producers. “If anything, unlimited exports would raise the price of American crude to the international level, which is why the producers want this step to begin with.”

The debate began in earnest two months ago when Energy Secretary Ernest Moniz suggested at a New York energy conference that it might be time for the country to reconsider the export ban that was instituted in the 1970s, when OPEC oil embargoes threatened the American economy. Congress at the time made oil exports illegal except for some shipments to Canada. The ban on exports of Alaskan North Slope crude was lifted in 1996.

The topic has renewed interest thanks to the oil industry’s reversal of fortunes in recent years. Only seven years ago the country’s domestic oil production appeared to be in a downward spiral. But with the advent of new extraction techniques, entire new fields were opened, replacing oil imports from unfriendly or unruly places like Venezuela and Nigeria.

Suddenly parts of the Midwest and Gulf of Mexico regions are overflowing with superior grades of crude, leading to a slump in prices and a gap of as much as $10 between American oil benchmark prices and the dominant world Brent price.

Even under current restrictions, crude exports are growing quickly. Shipments to Canada have already roughly tripled since 2012 to around 200,000 barrels a day. Some analysts say they think that figure will double by the end of the year.

While the entire oil industry has profited from all the domestic production, which has increased by about 60 percent to eight million barrels a day since 2005, refiners have particularly benefited. American refiners became darlings of Wall Street by buying cheaper domestic crude and now export 3.4 million barrels a day of gasoline, diesel and other refined products, mostly to Latin America and Europe.

Not surprisingly, both the producers and the refiners say they are on the side of consumers and national security, and each side has academic and consultancy reports to back up its position.

The producers argue that if they could freely export, they would increase world oil supplies, forcing down the international Brent benchmark crude price, which in turn would reduce the price of gasoline at the pump. “The American consumer is held captive by the restrained market,” said Jack Ekstrom, a vice president at the Whiting Petroleum Corporation, a major producer in the North Dakota Bakken shale field. “When you have additional supplies coming on to market, the price naturally comes down.”

Executives at the refineries, which struggled for decades, counter that adding another million barrels of United States oil of daily supply to a global market of 90 million barrels a day will make little difference. Instead, they say, domestic crude prices will climb higher and with them gasoline prices.

“The export ban works,” Graeme Burnett, chairman of Monroe Energy, which operates Delta Air Lines’ refinery in Trainer, Pa., told a Senate Energy Committee hearing last month. “We still have a long way to go to protect against oil market volatility and achieve true energy independence.”

Refinery executives concede that they cannot argue against free trade when they are exporting products themselves. Michael C. Jennings, chief executive of the HollyFrontier Corporation, said in an interview that he could support ending the oil export ban as long as other regulations that he said penalize the refiners, including federal mandates for the refining of expensive biofuels, were also reformed.

Such sweeping energy reforms are not likely to be enacted by Congress soon. But in their talks with Commerce Department officials and members of Congress, refiners and producers appear to be closing in on some short-term compromises.

Some executives have suggested that Commerce Department officials could approve swaps of lighter American crudes to Mexico for their heavier sour crudes without violating current oil export regulations. That would give the producers another market and give refiners more oil to process.

There appears to be growing support for recharacterizing condensates, the hydrocarbon liquids used for petrochemical production, from crude to natural gas liquids, so they might be exported under current regulations. That would ease gluts in Rocky Mountain and South Texas fields where drilling has already slowed.

And perhaps more oil could be sent to countries with free trade agreements with the United States.

Such compromises, some executives say, could look something like the arrangements for export of liquefied natural gas from the United States. While gas producers supported exports and some chemical companies opposed them, the Obama administration responded by approving export terminals slowly to gauge the impact on domestic energy prices in the future.

“The middle ground could probably be accomplished without any additional legislation,” said Stephen H. Brown, a vice president for federal government affairs at the Tesoro Corporation, a major Texas refiner, “and I think that is what this administration is probably hoping for.”

Such actions by the Commerce Department, Mr. Sheffield said, could be a “relief valve that would push off the problem for another two years.”

But after that, he and other executives said, the country will probably again face a glut of high-quality crudes if current production trends continue.