Abstract: The production declines have appeared in most domestic oilfields. And the production decline analysis is more and more important for traditional models for it are more complicated in calculation and prediction. This paper presents five history-match models for production decline/variation by means of mathematic statistics of the production history data. Case study indicates that these models are well used to run the history match and improve the accuracy of production prediction.

Key words: history match, curve, production decline, prediction, model