Dynamic calculation method and device for flow velocity of multiphase fluid

Abstract

The invention discloses a method and a device for dynamically calculating the flow velocity of a multiphase fluid. The method comprises the following steps of: receiving echo string data of the multiphase fluid at different flow velocities within a preset time length, wherein the echo string data is acquired by a nuclear magnetic resonance spectrometer in real time; the echo string data comprises amplitudes of a plurality of echoes of multiphase fluid arranged in a time sequence at different flow speeds; performing normalization processing on the echo string data to obtain the relative amplitude of each echo; according to the relative amplitude of each echo, performing linear fitting processing on the echo string data to obtain linear fitting data of the echo string; and the linear fitting data of the echo train is provided for the nuclear magnetic resonance multiphase flow meter, so that the nuclear magnetic resonance multiphase flow meter calculates the multiphase fluid flow speed in real time according to the linear fitting data of the echo train. Echo string data can be automatically collected, and the calculation error of the multiphase fluid flow velocity is reduced; meanwhile, echo train data can be collected in real time, and automatic dynamic calculation of the flow velocity of the multi-phase fluid is achieved.

Description

technical field [0001] The invention relates to the technical field of multiphase fluid measurement, in particular to a dynamic calculation method and device for multiphase fluid flow rate. Background technique [0002] This section is intended to provide a background or context for the embodiments of the invention recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Complex multiphase fluids containing multiple components are very common in the industrial field, and their accurate metering has always been a major problem in the industry. On-line detection systems for multiphase fluids are developed in this context. The nuclear magnetic resonance multiphase flowmeter is a new member of the multiphase fluid online detection system. It is based on the nuclear magnetic resonance technology to realize the online non-destructive detection of oil, gas, water and solid multiphase fluids in the petroleum industry. ...

AI Technical Summary

Problems solved by technology

However, unfortunately, the selection of this period of time is highly targeted, and changes in fluid properties, content, and components will affect the linearity of this segment of the echo train

Therefore, the parameters of the traditional nuclear magnetic resonance multiphase flowmeter flow velocity measurement method cannot be dynamically adjusted according to fluid changes, which eventually causes the measurement error of multiphase fluid flow velocity to increase.

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