The recent surge in oil prices is just a “head-fake,” and oil as cheap as $20 a barrel may soon be on the way, Citigroup said in a report on Monday as it lowered its forecast for crude. Despite global declines in spending that have driven up oil prices in recent weeks, oil production in the U.S. is still rising, wrote Edward Morse, Citigroup’s global head of commodity research. Brazil and Russia are pumping oil at record levels, and Saudi Arabia, Iraq and Iran have been fighting to maintain their market share by cutting prices to Asia. The market is oversupplied, and storage tanks are topping out. A pullback in production isn’t likely until the third quarter, Morse said. In the meantime, West Texas Intermediate Crude, which currently trades at around $52 a barrel, could fall to the $20 range “for a while,” according to the report. The U.S. shale-oil revolution has broken OPEC’s ability to manipulate prices and maximize profits for oil-producing countries.