ABSTRACT

Well testing is one of the important methods used to provide information about the reservoir’s heterogeneity and boundary limits by analysing reservoir dynamic responses. Despite the significance of well testing data, misinterpreted data resulting from using pressure data against time in transient well testing can lead us to a wrong reservoir performance prediction especially the problem non-uniqueness. Regarding the importance of reservoir characteristics and its flow regime, any wrong interpretation may create huge uncertainties in the reservoir development.

In this study, we focus on using pressure derivative instead and studying the effects of wellbore radius on dimensionless pressure derivative on a vertical well in a bounded reservoir. The dimensionless pressure derivative was plotted with different dimensionless time on a log-log plot to form different type curves.

Results shows that for increasing wellbore radius, it requires greater value of dimensionless time (thus more time) for the value to converge at a constant value of 0.5

The results obtained from the developed equations and plots will help in the correct design and completion of wells in the reservoir and points of perforation locations for prolonged clean oil production.