Abstract
Summary Naturally fractured reservoirs that undergo waterflooding or steam injection or that are acid-stimulated frequently can be modeled as a composite naturally fractured reservoir with matrix skin. A new analytical solution is presented in Laplace space for such a model that includes wellbore storage and skin. Design and analysis methods for pressure-transient tests based on the pressure derivative are also presented. Correlating parameters have been found that ease test design and analysis. Practical methods to determine the size of the inner zone are given. These methods are based on a scaled deviation time from the semilog straight line. A field example for an acidized well is presented.
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