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Well test interpretation is the process of obtaining information about a reservoir through examining and analyzing the pressure-transient response caused by a change in production rate. This information is used to make reservoir-management decisions. It is important to note that the information obtained from well test interpretation may be qualitative as well as quantitative. Identification of the presence and nature of a no-flow boundary or a down-dip aquifer is just as important as, if not more important than, estimating the distance to the boundary.

This textbook focuses on well test interpretation rather than well test analysis . Much of the literature on well test analysis focuses on finding solutions to the transient flow equation for new boundary conditions, using advanced tools such as Bessel functions, Laplace and Fourier transforms, and Green functions. Even applied well test analysis is often thought of as simply estimating reservoir properties by drawing straight lines or matching curves. Interpretation, in contrast, seeks first to understand the nature of the reservoir that produced the pressure response, and only then to quantify the physical properties that describe the reservoir.

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