Abstract
Summary This paper presents a new set of type curves used in well-test analysis for homogeneous reservoirs with wellbore storage and skin effects. When the pressure/pressure-derivative ratio (PDR) is used as a parameter in constructing the type curves, the vertical scales on both type-curve and field-data plots are identical. This automatic alignment of the vertical scale makes the new type curves easier to match and, subsequently, easier to use in the computer-aided analysis. The paper concludes that use of the new type curves reduces the uniqueness problem in pressure-transient type-curve matching, identifies the flow regimes effectively, and gives greater confidence in the results. A new method to correct the pressure buildup when drawdown type curves are used in radial-flow wells is also proposed. Two example applications, one with a long producing time and one with a short producing time before shut-in, are included to demonstrate the use of these type curves.
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