Second derivative yields new insights to well test analyses

Well test analyses that include the first and second derivative of pressure plotted on a semilog scale can help detect radial flow.Plots of pressure data from short transient tests often fail to detect the radial-flow regime, but one can deduce this flow regime from the zero-slope line with a certain intercept on the first-derivative curve and a zero-slope line with zero intercept on the second-derivative curve.A transient-pressure test in one of Iran’s gas reservoirs illustrates the application of these analyses.Pressure-transient tests Pressure-transient tests for characterizing a reservoir involve the analysis of fluid flow through the reservoir and into the well.1 Both single an...

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