Uncertainty is inherent in any nonlinear inverse problem. Well test interpretation suffers from a particularly unfortunate variety of uncertainties that combine to reduce the confidence that can be associated with the answers obtained. Nonetheless, well test data provide one of the few effective methods of direct reservoir analysis, and therefore it is important for petroleum engineers to overcome as much of the uncertainty as possible, and to understand that part which cannot be overcome. This paper will attempt to summarize the uncertainties found in well test analysis, will show examples of the difficulties, and will discuss methods that have been proposed to reduce or eliminate them.

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