Dynamic Simulator of Centrifugal Pump -Borehole-Reservoir System and Algorithm of Production Optimization

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The simulator allows accounting for interaction between reservoir of complex structure (layered or fractured), borehole with multiphase fluid flow and a down-hole centrifugal pump. Such a consideration of the system allows more adequate simulation of processes which take place during well production. A reservoir-borehole-pump simulator has about 45 parameters controlling the system. As the simulator takes into account filtering of a two-phase liquid through a reservoir of complex structure and flow of three-phase fluid through borehole and corresponds all three elements of the system it will maximize well production. This will allow decreasing risk of switch from production regime into gas mode for well equipped with downhole centrifugal pump. An algorithm for production optimizing was developed based on the simulation results.It allows to determine optimal location, productivity and inlet pressure of pump. Solution is presented in graphical form with animated graphs and diagrams. Displayed values are borehole flow rate, downhole pressure, liquid level in annular space of a borehole, gas content and pressure in the point of inflow, pressure distribution in reservoir and borehole, position of the degassing level in borehole (or in reservoir), interflow distribution if reservoir is of complex structure etc.