21. ConocoPhillips - 2 million barrels per day

This year ConocoPhillips spun off its refining business as Phillips 66 to focus on upstream operations. It may not have wanted its refineries, but strangely, Delta Air Lines did. This picture is of the Trainer, Pa. plant that Delta bought in hopes of paring its jet fuel bill.(Note: 2012 working interest production volumes calculated by Wood Mackenzie reflects oil plus the energy equivalent in natural gas.)