The first carbon dioxide (CO2) huff ‘n’ puff experimental project was conducted in 1997 in Jiangsu oilfield, China. This paper reviews design and performance data on 70 CO2 huff ‘n’ puff projects conducted in different wells in Jiangsu oilfield from 1997 to 2004. For the Jiangsu reservoirs with light crude oils, reversal of production damage and enhancement of oil swelling aided by gravity drainage are believed to be the most significant mechanisms contributing to increases in oil recovery. The objective of this paper is to examine important parameters, best practices and lessons learned that contributed to the success of CO2 huff ‘n’ puff operations and their use in further improvement in CO2 huff ‘n’ puff projects.

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