FILE - In this July 26, 2011 file photo, Austin Mitchell, left, and Ryan Lehto work on an oil derrick outside of Williston, N.D. In 2012, domestic crude oil production achieved its biggest one-year gain since 1951, driven by output in North Dakota and Texas. The United States is on pace to pass Saudi Arabia as the world’s top oil producer within two years. (AP Photo/Gregory Bull, File)

Associated Press
FILE - In this July 26, 2011 file photo, Austin Mitchell, left, and Ryan Lehto work on an oil derrick outside of Williston, N.D. In 2012, domestic crude oil production achieved its biggest one-year gain since 1951, driven by output in North Dakota and Texas. The United States is on pace to pass Saudi Arabia as the world’s top oil producer within two years. (AP Photo/Gregory Bull, File)
FILE - In this July 26, 2011 file photo, Austin Mitchell, left, and Ryan Lehto work on an oil derrick outside of Williston, N.D. In 2012, domestic crude oil production achieved its biggest one-year gain since 1951, driven by output in North Dakota and Texas. The United States is on pace to pass Saudi Arabia as the world’s top oil producer within two years. (AP Photo/Gregory Bull, File)
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