Not really related directly to this post but I've been wondering about it for a while.
Why does crude go up when there are refinery problems? I can see why the price of refined products jumps but it just doesn't make sense to me why the price of oil goes up.  In fact, if the amounts weren't so marginal I'd expect the reverse - less refinery capacity, less demand for crude.
But I'm just a historian so probably there's something about oil market economics that I don't understand.