Defining the flow rates in horizontal two-phase water-gas flows and operation features of a conical narrowing device in a multiphase flowmeter with a gamma-densitometer


Аuthors

Filippov Y. P.1, Filippov A. Y.2

1. Joint Institute for Nuclear Research, Dubna, 141980, Russia
2. National Research University “Moscow Power Engineering Institute”, 14, Krasnokazarmennaya str., Moscow, 111250 Russia

Abstract

The operation of the conical narrowing device (ND) in horizontal two-phase water-gas flows is analyzed on the basis of the experimental data and calculation technique. This is a particular operation case of a three-phase oil-water-gas flow meter based on a dual energy gamma-densitometer and ND. The article offers two methods to estimate the main factors influencing the characteristics of the ND, such as pressure losses due to friction and a possible crisis of hydraulic resistance. We consider interrelation of the volumetric flow rates, pressure drops across the ND, thermophysical properties of components, volumetric gas contents, friction factors and a found correction factor for applied homogeneous model considering a crisis of hydraulic resistance in the ND. For the real narrowing device with diameters of 98 and 70 mm, the experimental data were obtained for volumetric water flow rates from 24 to 48 m3/h and volumetric gas content from 0 to 70% at the temperature of about 20oC at the State standard of multiphase flows GET195-2011 in Kazan. It is shown that the greatest contribution to the real characteristics of the ND is caused by the correction factor, which weakly depends on the volumetric flow rates of water and changes significantly with the growth of gas content. The gas content of the flow is determined by means of a gamma densitometer. Quantitative indicators of this characteristics depending on the volumetric gas content are determined that allows one to define the flow rate of the two-phase flow with maximum relative deviations of about ±5% at maximum gas content. This is quite optimistic, given the specifics of the experiments. The conditions for existence or absence of the crisis of hydraulic resistance in the ND are discussed.

Keywords:

gamma-densitometer, two-phase flow, narrowing device, oil, water, gas, friction factor, crisis of hydraulic resistance

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