Over the last years there is a great progress in the dynamic simulation approach to wellbore processes modeling. First of all, it is explained by the reason that classic modeling method (nodal analysis) is unable to take into account every wellbore transient processes completely. The processes, in their turn, constitute an integral part of the well performance during the start-ups – shutdowns, changes of well operation mode.

The main objective of this study is to develop qualitative and quantitative understanding of well transient processes and opportunity to optimize the well operation as well. This problem is important today because there is no reliable instrument enabling to estimate and optimize well operation under the transient processes.

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