Method for fluid level depression test interpretation based on modern multiphase flow calculation techniques

To increase the accuracy of bottomhole flowing pressure estimation, new method of depression test interpretation is presented. The method implements modern techniques of multiphase flow calculation and inverse problem regularization algorithm. Additional well performance data could also be obtained from this method of interpretation (GOR, annular gas rate and, in many cases, separation efficiency at the ESP intake). Comparing the results obtained using this method against actual measurements using multiphase flow meters and pump intake gauges has verified the confidence level of this method and model of well processes during fluid depression test.