Abstract
This chapter deals with pressure derivative application to gas well test analysis that involves the combined use of existing type curves in both the conventional dimensionless pressure form (PD) and the new dimensionless pressure derivative grouping (P′D′ x tD/CD). Thus, 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 are hard to distinguish because of similarities between reservoir system and other, which are easier to recognize on the pressure-derivative plot. Prefracture information about the reservoir is necessary to estimate fracture parameters.
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