Simulator of Borehole/Reservoir System for Formation Tests and Production Optimization ﷯ We have several versions of this simulator: - Rod pump - Centrifugal pump - Fountain mode The simulator allows accounting for interaction between the reservoir of complex structure (including layered or fractured) and a borehole with multiphase fluid flow. The third element of the system is a two-phase choke, a rod pump or a down-hole centrifugal pump. The simulator has about 30 parameters controlling its calculations. It allows investigating and creating methods for well production tests, both on tubing or logging cable. The simulator allows investigation of influence of 1) reservoir properties upon apparent permeability, 2) degassing of oil in the formation upon phase permeability, 3) quality and extent of perforation upon results of measurements, 4) fluid exchange between layers upon measurements, 5) presence of high permeability layer upon depression value near bottom hole, 6) influence of a choke or a pump upon functioning of the whole system etc. For both pump-assisted or fountain production the simulators allow to find an optimum regime of well exploitation to increase production of the well. For fountain mode it means changing choke diameter, proper perforation and maintaining correct flow rate. For pump-assisted production this means picking the optimal location, productivity and inlet pressure. The simulator may also be used for theoretical researches bound with injection wells and hydraulic fracturing. The solution is presented in graphical form on the screen being a set of izobars inside the reservoir, diagrams of bottom hole pressure and flow versus time. Optionally user can enable transit pressure curves to be processed according to Horner’s method.