America’s shale producers already had a profitability problem. It just got a lot worse. At a stroke, Saudi Arabia and Russia and their battle for market share have made almost all U.S. shale drilling unprofitable. Only five companies in two areas of the country have breakeven costs lower than the current oil price, according to data compiled by Rystad Energy, an Oslo-based consultancy.

Wells drilled by Exxon Mobil Corp., Occidental Petroleum Corp. Chevron Corp. and Crownquest Operating LLC in the Permian Basin, which stretches across West Texas and southeastern New Mexico, can turn profits at $31 a barrel, Rystad’s data show. Occidental’s wells in the DJ Basin of Colorado are also in the money at that price, which is where oil settled Monday.

But that’s not the case for the rest of the shale industry — more than 100 operators in a dozen fields. For them, drilling new wells will almost certainly mean going into the red.

Shale projects are heralded for their ability to be quickly ramped up and down. But because output from these wells declines much faster than from their old-school, conventional cousins, companies have to drill more of them just to keep output flat. That has meant sluggish investor returns, one of the main reasons oil and gas represents less than 4% of the S&P 500 Index.

At this point, “companies should not be burning capital to be keeping the production base at an unsustainable level,” said Tom Loughrey, a former hedge fund manager who started his own shale-data firm, Friezo Loughrey Oil Well Partners LLC. “This is swing production — and that means you’re going to have to swing down.”