BISMARCK, N.D. (AP) -- The Department of Mineral Resources says North Dakota oil drillers pumped a record 25.1 million barrels of crude in May.
The agency says the state produced an average of about 810,000 barrels per day in May. That's up from 639,000 barrels in May 2012 and more than double the amount of barrels produced for the same month in 2011.
The agency says there were 8,915 producing wells in May. That's up from 5,570 wells in May 2011.
The May tally is the latest figure available because oil production numbers typically lag at least two months.