The important thing for OPEC in balancing the oil market is to flip the futures curve. Goldman Sachs warned that till the oil futures market strikes decidedly right into a state of backwardation, OPEC might wrestle to considerably drain inventories. Because it stands, the market contango – a state of affairs during which near-term oil futures commerce at a reduction to deliveries six or twelve months out – permit shale drillers to hedge their future manufacturing and lock in larger costs for supply at a later date. That gives shale corporations with the knowledge of…