Abstract
ABSTRACT The derivative analysis has been shown to be an important tool in identifying flow regimes and also to be of assistance for type curve matching pressure data. This paper extends procedures to analyze pressure data by suggesting new applications of the derivative method to determine formation parameters and initial reservoir pressure. It is shown that specific equalities exist between pressure changes and its derivative and that these relations can be used to analyze buildup data when the effect of producing time on buildup data is important including data following a slug test or an "impulse"test. It is also shown that the derivative method can provide a quantitative measure of the accuracy of the slope of the semilog straight line.
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