Method and device for determining stage number of centrifugal separators for drainage of gas well electric pump

The invention belongs to the field of gas-liquid separation calculation methods, and particularly relates to a method and device for determining the stage number of a centrifugal separator for drainage of a gas well electric pump. The method comprises the following steps: (1) determining the total volume ratio R0 of liquid at an inlet of a first-stage separator to a gas-liquid mixture according to the gas well gas output and liquid output; (2) determining the total volume ratio of the liquid at the outlet of the liquid channel to the gas-liquid mixture according to the separation volume ratio of the split-flow liquid and the gas channel of the separator, and judging whether the total volume ratio of the liquid to the gas-liquid mixture is greater than 95% or not; and if the volume ratio is not larger than 95%, the number of stages of the separators is increased, and the liquid-gas ratio of the liquid channel outlet of the previous-stage separator serves as the liquid-gas ratio of the inlet of the next-stage s