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Seeking synergy between drawdown and buildup analyses. C.S. Kabir. SPE Formation Evaluation., June 1997, 12(2), 125--131.

A method is presented to interpret drawdown data whenever variable rates are encountered, either inherent in a test or induced by design, such as in a gas-lift well test. Buildup data are interpreted assuming a constant rate during drawdown. The estimated parameters are used to compute instantaneous rate corresponding to each pressure data point by superposing constant-pressure solution with an appropriate dimensionless-pressure model. Field examples are reported. 19 refs.
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