Portable ECT system with image correction function

Abstract

The invention discloses a portable ECT (Electronic Computed Tomography) system with an image correction function. The portable ECT system comprises a detachable ECT sensor module used for being mounted on a pipeline to be detected, a data acquisition unit is connected behind the ECT sensor system, the data acquisition unit is used for primarily processing acquired data by a data processing and correction module, and the image is further corrected according to the sensitivity provided by a cloud platform sensitivity online computing server connected with the 5G communication module or a local sensitivity database memory, and the corrected image is displayed by a local image display system. According to the invention, the nonlinear problem and the portable application problem of the electrical tomography technology can be effectively improved, and effective phase flow pattern measurement can be carried out on pipelines within a certain range.

Description

technical field [0001] The invention belongs to the technical field of instruments and meters, and in particular relates to a portable ECT (electrical capacitance tomography) system with an image correction function. Background technique [0002] At present, in the measurement of multiphase flow parameters, gas-liquid (water) as the most typical and widespread two-phase flow is the basis of multiphase flow research. The problem of image reconstruction and phase separation holdup measurement in two-phase flow is the basis of flow pattern identification, flow (volume flow, mass flow) and other parameters measurement, and is also an important parameter of industrial process control. [0003] The medium in the natural gas transmission pipeline is a typical gas-liquid (water) two-phase flow. When natural gas is extracted from the formation, water is often mixed in the pipeline, and this situation is more obvious in the later stage of exploitation and in some areas with high wate...

AI Technical Summary

Problems solved by technology

However, the measurement strategies described above suffer from time delays and the inability to distinguish between individual wells in the field

The natural gas industry urgently needs to measure the water content of each gas well online, however, there are two key factors that limit the feasibility of measuring each well individually: one is that the instruments that meet the needs of field measurement are too expensive to monitor individually ( e.g. Coriolis mass flow meters); another is that these instruments typically fail over a wide range of operating conditions (e.g. differential pressure flow meters) due to their high measurement accuracy and the risk of pipe blockage

[0004] In addition, for the measurement technology of the electrical method, due to the "soft field" characteristics (that is, nonlinear problems) of the non-invasive electrical capacitance tomography technology, it cannot accurately reflect the distribution change of the sensitivity, resulting in the measurement of gas-water two-phase flow parameters. Large errors in reconstructed images and water cut measurements in the application

Therefore, the nonlinearity is particularly serious when the conductivity or permittivity of the phase separation in the object field is too large

For example, in the gas-water two-phase flow, the conductivity and permittivity of water are relatively high, and the linearization assumptions of ECT can only be satisfied when the fluctuation of the permittivity is small, so for the gas-water in the aqueous phase In the measurement of two-phase fluid phase holdup, etc., the accuracy of ECT is often not enough

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