Список проголосовавших за комментарий "vito333, Decades-old oil wells that pump low-grade North Dakota sour crude are in danger of being shut down if prices hold at near worthless levels, the state's oil industry group said Tuesday.<p>Sour crude is oil that's high in sulfur and more difficult to refine than low- or no-sulfur sweet crude. Sour crude represents about 0.5 percent of North Dakota's oil production and most of the 754 wells pumping it are in aging fields on the northern edge of the state's oil patch in Bottineau and Renville Counties, near the U.S.-Canada border.</p><p>Sour crude prices slipped to $1.50 a barrel on Friday but rebounded to $8.50 a barrel on Tuesday. North Dakota sour crude fetched about $14.80 in January 2015.</p><p>North Dakota Petroleum Council President Ron Ness said if sour crude prices were to hold at just a couple of dollars a barrel, the wells will likely be shut down until prices rebound.</p><p>Some of the wells have been producing since oil was first discovered in North Dakota in the 1950s, he said.</p>"