Abstract
The pressure derivative application in oil well test analysis involves the combined use of existing type curves in both the conventional dimensionless pressure form and the new dimensionless pressure derivative grouping. This new approach has combined the most powerful aspects of the two previously distinct methods into a single-stage interpretive plot. Use of the pressure derivative with pressure behavior type curves reduces the uniqueness problem in type curve matching and gives greater confidence in the results. Features that are hardly visible on the Horner plot or that are hard to distinguish because of similarities between a reservoir system and another are easier to recognize on the pressure derivative plot. A new technique presented in this chapter analyzes data in the bilinear flow period. New type curves are now available for pressure analysis of fractured oil wells, and the problem in the analysis is reduced considerably with the use of these type curves. Prefracture information about the reservoir is necessary to estimate fracture parameters.
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