Crude oil well productivity rose sharply in the 1960s and reached a peak of 18.6 b/d per well in 1972, according to the U.S. Energy Information Administration (EIA) Annual Energy Review 2009. After 1972, productivity trended downward to a 55-year low. The 2008 rate of 9.4 b/d per well was 51 percent of the 1972 peak. In 2009, productivity rose to 10.1 b/d per well.
Natural gas well productivity, measured as gross withdrawals per day per well, grew rapidly in the late 1960s, peaked in 1971, and then fell sharply until the mid-1980s. Productivity remained fairly steady from 1985 through 1999, fell annually through 2008, and turned up slightly in 2009.
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