УДК 622.276.054.23+621.67
(UDK 622.276.054.23+621.67)
(ANALYSIS OF PUBLICATIONS ON PUMPING MULTIPHASE MIXTURES BY ELECTRICAL SUBMERSIBLE PUMPS)
Электроприводные лопастные насосы являются оборудованием, наиболее широко применяющимся в России для механизированной добычи нефти. Для обеспечения оптимальных условий работы электроприводные лопастные насосы должны функционировать в пределах рабочей части характеристики. При этом попадание свободного газа на прием лопастного насоса препятствует повышению давления и часто приводит к выходу режима работы насоса на газожидкостной смеси за границы рабочей части характеристики. Теоретические и экспериментальные исследования показали, что присутствие свободного газа в перекачиваемой среде может привести к ухудшению рабочих характеристик электроприводных лопастных насосов. Нестабильность потока газожидкостной смеси внутри насоса, сопровождающаяся скачками давления и образованием газовых карманов или каверн, также ухудшает способность насоса повышать давление. Следовательно, важно знать, какие параметры определяют структуру газожидкостного потока внутри рабочих каналов электроприводного лопастного насоса и как ее можно смоделировать. В статье анализируются опубликованные работы, в которых были предложены к применению эмпирические и механистические модели определения допустимого свободного газосодержания в электроприводных лопастных насосах. Приведено сравнение результатов расчетов допустимого свободного газосодержания по опубликованным методикам и стендовых испытаний электроприводных лопастных насосов при работе на газожидкостной смеси.
Electrical submersible pumps are the equipment most widely used in Russia for mechanized oil production. To ensure optimum operating conditions, electrical submersible pumps must work within the operating part of the characteristic. At the same time, getting free gas at the vane pump inlet prevents pressure increase and often leads to transition of the pump operation mode to gas–liquid mixture beyond the limits of the working part of the characteristic. Theoretical and experimental studies have shown that the presence of free gas in the pumped media can lead to a deterioration in the performance of electrical submersible pumps. The instability of the gas–liquid mixture inside the pump, accompanied by pressure peaks and the formation of gas pockets or caverns, further impairs the pump's ability to build up pressure. Hence, it is important to know what parameters determine the gas–liquid flow pattern inside the working channels of an electrical submersible pump and how it can be modelled. The paper analyses published works in which empirical and mechanistic models for determining acceptable free gas content in electrical submersible pumps have been proposed for use. The results of calculations of allowable free gas content according to published methods and bench tests of electrical submersible pumps during work on gas–liquid mixture are compared.
A.V. Ivanovskiy1, e-mail: alivan95@yandex.ru
R.M. Shaykhulov1, e-mail: ruslan.shajhulov96@mail.ru
T.R. Dolov1, e-mail: dolovtemir@yandex.ru
1 Federal State Autonomous Educational Institution for Higher Education “Gubkin Russian State University of Oil and Gas (National Research University)” (Moscow, Russia).
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