Fluid density measurement device

Abstract

A device for determining a density of a fluid is described. The devices comprises a mechanical resonator, a driver / receiver unit arranged to provide an actuation to the mechanical resonator, sense a response of the mechanical resonator to the actuation, and provide an output signal representing the response; and an evaluation unit. The evaluation unit of the device is arranged to i. determine an oscillation distribution from the output signal, ii. determine a resonance frequency estimate from the oscillation distribution, and iii. determine the density of the fluid based upon the resonance frequency estimate. The device according to the invention enables a more accurate determination of the fluid density for fluids comprising immiscible components (thus forming a heterogeneous mixture), like a water-oil emulsion, or a fluid with occluded gas.

Description

technical field [0001] The invention relates to a device for measuring the fluid density of different media, including aggressive media, both under normal conditions and under high pressure environments. As an example, the invention may be applied to crude oil and gas production and delivery systems in chemical and petrochemical production and fuel and energy industries, among others. Background technique [0002] Devices for measuring or determining the density of fluids are known per se. The operating principle of this known device is eg based on the application of a low-frequency mechanical resonator immersed in a fluid whose density is to be determined. In this regard, reference may be made, for example, to the Government of the Russian Federation Patent No. 2 291 403, US Patent No. 4 922 745, US Patent No. 6 389 891, US Patent No. 6 845 663. Due to the effect of increasing mass of the medium (eg fluid), the resonant frequency of the mechanical resonator changes. Know...

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Problems solved by technology

[0004] First, if it is used to measure the density of a fluid composed of immiscible components (heterogeneous mixture) like a water-oil mixed emulsion, the properties of the medium around the tuning fork will cause changes in the resonance characteristics, causing inaccuracies in the resonance frequency measurement. deterministic, which ultimately adversely affects measurement accuracy

[0005] Secondly, since the presence of clogging gas causes appreciable and sudden changes in the resonant frequency, affecting its mean value and impairing the determination of the fluid's density, the known device has been found unsuitable for measuring the density of fluids containing such clogging gas

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