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Infinite-acting radial flow (IARF) is arguably the most common flow regime encountered in pressure transient analysis. This chapter presents straight-line analysis methods for analyzing data in IARF. The pressure response during IARF is a linear function of the logarithm of time. Thus, straight-line analysis methods for IARF use either logarithmic time scales or time plotting functions involving logarithms or sums of logarithms.

Section 3.2 addresses the topic of drawdown tests, in which the well is initially shut in, and the reservoir is at uniform pressure. The well is opened to flow, and the resulting pressure response is measured as a function of time. The section opens with a discussion of analysis of drawdown tests conducted at constant rate. Unfortunately, it is difficult to maintain a perfectly constant flow rate, and even small changes in flow rate over the course of a test may radically distort the shape of the pressure response. If the rate is changing slowly and smoothly, and if the reservoir is infinite acting for all times of interest, rate normalization may be used to account for changing flow rate.

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