Abstract: Exponential decline is an important forecasting method in oil and gas reservoir engineering. It can be used for prediction of produc-tion, cumulative production and recoverable reserves in depletion stage. The method is applied in prediction of condensate gas reservoir, andbetter results have been obtained. It is concluded that the decline regularities of the total well fluid production, dry gas production and conden-sate production accord with the exponential decline rule.

Key words: condensate gas reservoir, exponential, decline, prediction, application