sentences:  Unexpectedly, North Dakota production also increased because of hydraulic fracturing in the Bakken formation, making ND the second largest US producing state after Texas.Oil production from ND was delivered through the Canadian pipeline system, so the glut of new oil forced feedstock prices to US refineries on the Canadian pipelines down and made them much more profitable than refineries elsewhere in the US or Europe.PADD 3 (United States Gulf Coast) has half of the oil refining capacity in the US.