Field data are requisite in order to set up a realistic reservoir model capable of predicting the dynamic field behavior during the development stage of an oilfield. Well testing is considered as one of the most useful methods for obtaining reservoir and wellbore data. Numerous analytical models are utilized in analyzing vertical-well pressure transient tests, however, horizontal-well transient tests analysis has been considered as a more difficult undertaking. In this article, well test data of a horizontal well are simulated for homogeneous isotropic and anisotropic reservoirs. The data are later used in order to develop an empirical correlation that ratifies the vertical reservoir permeability estimated by well testing.