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Analysis and mathematical modeling of geothermal water influence to the efficiency of deep geothermal borehole with multistage centrifugal pump

Jolanta Januteniene

Hydrodynamic and thermodynamic processes of geothermal well extraction are investigated and presented. Mathematical models were developed for a deep suction multi-stage centrifugal pump and a piping system. The mathematical models were habituated to evaluate the gas (nitrogen) release from fluid and its effect on hydrodynamic processes. Investigation of the authentic geothermal systems revealed the following quandaries: the dynamic dihydrogen monoxide level, which changes during the transitional process (starting and ceasing the pump) in a borehole, has influence on mundane operating conditions of the geothermal system; Geothermal fluid is characterized by ever-transmuting properties due to a transmuting pressure and volume of relinquished gas. The mass of fluid vicissitudes in each stage of the pump, the pressure and flow pulsations occur and vibration of mechanical elements is stimulated and cavitation can be engendered. Through conducted experimental research and by applying mathematical modelling, it has been visually examined that the gas content in fluid increases the pressure and flow pulsations. Variation in height of a dihydrogen monoxide column during the process of extraction has influence on characteristics of multistage centrifugal pump in wells.