Influence of the location of local resistances on the stability of the transportation of steam-water mixture during the development of geothermal resources

Using a new mathematical model for the hydraulic calculation of pipelines transporting a steam-water geothermal heat carrier, which takes into account the influence of gravity forces on the flow parameters, a study was made of the influence of the location of local resistances on the flow stability. The calculation was carried out using the SWIP-S program for a pipeline with characteristics close to typical values at the Mutnovsky geothermal field, where the larg-est geothermal power plants in Russia are located. The pipeline was divided into 4 sections, 4 options were consid-ered with the placement of all local resistances on the first (from the beginning), second, third and fourth sections The flow stability index was calculated, defined as the partial derivative of the pressure drop in a separate section of the pipeline by mass flow. The pressure drop was also calculated. An insignificant effect of the location of local re-sistances along the pipeline route on its total stability index, as well as on the total pressure drop, was revealed. Based on the calculations of the parameters of pipeline by sections, taking into account the significant differences in the lo-cal index of stability, practical recommendations are given on the location of local resistances: in the case of a high risk of instability at the wellhead, including at low flow rates of geothermal fluid, it is recommended to place them at the beginning of the route, i.e. near the well. Similar recommendations are given if it is necessary to reduce the total pressure drop, given that this parameter will sharply increase in the area where local resistances are focused.

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