Somebody sneezed in Iran. And even though the Saudis have promised to ramp up production to make up for anything the Iranians pull off the market, the speculators drooled because they could screw the public again.
And US producers are exporting record amounts to China and India, which is keeping the price artificially high here. Big oil says we need to drill more domestically to stop us from relying on foreign oil, then they export more than half of what we produce here because they can charge a higher price for it.