<P> Each year, tens of thousands of wells are drilled in search of oil and gas in the U.S. In 2009, 36,243 wells were drilled . </P> <P> Top producing oil fields in the United States, 2013 </P> <Table> <Tr> <Th> Rank </Th> <Th> Field </Th> <Th> State </Th> <Th> Discovery Year </Th> <Th> Million Bbl / Year </Th> </Tr> <Tr> <Td> </Td> <Td> Eagle Ford Formation </Td> <Td> Texas </Td> <Td> 1962 </Td> <Td> 308.3 </Td> </Tr> <Tr> <Td> </Td> <Td> Bakken formation </Td> <Td> North Dakota and Montana </Td> <Td> 1953 </Td> <Td> 123.8 </Td> </Tr> <Tr> <Td> </Td> <Td> Spraberry Trend </Td> <Td> Texas </Td> <Td> 1949 </Td> <Td> 99.8 </Td> </Tr> <Tr> <Td> </Td> <Td> Prudhoe Bay Oil Field </Td> <Td> Alaska </Td> <Td> 1967 </Td> <Td> 79.1 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Wattenberg Gas Field </Td> <Td> Colorado </Td> <Td> 1970 </Td> <Td> 47.3 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Shenzi </Td> <Td> Federal Gulf of Mexico </Td> <Td> 2002 </Td> <Td> 35.3 </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Kuparuk River oil field </Td> <Td> Alaska </Td> <Td> 1969 </Td> <Td> 29.5 </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Midway - Sunset Oil Field </Td> <Td> California </Td> <Td> 1901 </Td> <Td> 28.8 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Atlantis Oil Field </Td> <Td> Federal Gulf of Mexico </Td> <Td> 1998 </Td> <Td> 27.3 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Sugarkane </Td> <Td> Texas </Td> <Td> 2009 </Td> <Td> 25.8 </Td> </Tr> <Tr> <Th_colspan="5"> Annual production 2013 . Source: </Th> </Tr> </Table> <Tr> <Th> Rank </Th> <Th> Field </Th> <Th> State </Th> <Th> Discovery Year </Th> <Th> Million Bbl / Year </Th> </Tr>

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