In a multitransient test in the Bombay High field offshore India, simultaneous measurement of downhole pressure and flow rate enables identification of early- and late-time pseudoradial-flow regimes and intermediate linear flow. Analysis of these successive flow regimes yields estimates of the an isotropic formation permeabilities and the mechanical skin factor. In a second interpretation step, these estimates are refined through a weighted, nonlinear least-squares history match of either the measured transient-wellbore-pressure or the flow-rate data. An algorithm is presented to compute the well rate from transient pressure, given the characteristic response model of the single-well system.