Express evaluation of the efficiency of using a cone-shaped electric submersible pump when pumping out gas-liquid mixtures from a well. Part 2
UDC: 622.276.53.054.23:621.67-83
DOI: 10.33285/0207-2351-2022-4(640)-57-65
Authors:
GORIDKO KIRILL A.1,
BILALOV RADMIR R.1,
VERBITSKY VLADIMIR S.
1
1 National University of Oil and Gas "Gubkin University", Moscow, Russia
Keywords: electric submersible pump, gas-liquid mixture, tapered pump, simulation
Annotation:
A bottomhole pressure decrease combined with an increased flow rate leads to a higher free gas volume fraction at the pump intake at the pressure less than the bubble-point pressure. One of the methods to minimize the harmful effects of free gas on the electrical submersible pump (ESP) operation is to use the tapered pump section design on the principle of using impellers with decreasing flow rates and increasing pump section heads in the conditions of changing properties of the pumped gas-liquid mixture. Despite the simplicity of the tapered pump operating principle, there may be difficulties in correctly determining the degradation of the ESP performance and, consequently, in changing the well’s operating mode. The first part of the article presents a methodology for recalculating the head and flow rate characteristics of the ESP when pumping gas-liquid mixture, with determination of the head derating coefficient.
The second part of the article presents the results of hydrodynamic modelling of the well operation with a tapered pump in the educational version of the Pipesim simulator and also assesses the reliability of the calculation methodology presented in the first part of the article. A comparative analysis was made of the basic parameters of the tapered and cylindrical ESP units: flow rate, head derating factor, number of cavitating stages, specific power consumption and efficiency.
Bibliography:
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