Hoeven, industry want study of North Dakota oil potentialSeattle TimesBISMARCK, N.D. (AP) — North Dakota oil drillers and U.S. Sen. John Hoeven want federal geologists to reevaluate the amount of recoverable crude oil in the state, saying a new assessment …

CNBCVenezuela state oil firm's credit woes spread to US unit CitgoCNBCWashington's recent sanctions against Venezuelan state-run oil company PDVSA have started to ensnare its U.S. unit, Citgo Petroleum, making it harder for the refiner to obtain th …