As Saudi Arabia cuts even more oil than promised, U.S. shale production is up by 176,000 barrels per day—but it’s the frac sand industry that will feel the real revolution, and micro-cap sand producers who have flown under the radar until now are about to come up for some very lucrative air. But the U.S. shale rebound started even before the historical OPEC deal—so we’re already running out of time to get in on the frac sand euphoria. Last week, the Saudis said they had cut production to below 10 million barrels per day,…