Study On Estimation Algorithm Of Optical Fiber Probe Void Fraction Based On Data Fusion And Implementation

Parameter measurement of multiphase flow is not only a worldwide problem, but alsogenerally exists in the dynamic monitoring of oil-gas field development in the world, andit’s still a problem to be solved urgently. As void fraction is an important parameter ofoil-gas-water three-phase flow, its accurate measurement is of much importance to theoil-gas field development and the real-time dynamic monitoring. In recent years, opticalfiber sensing technology is widely used in measuring void fraction of three-phase flow,and thus conducting much more study on it has always been an important topic in currentthree-phase flow detection field research. In this paper, we mainly study on the estimationalgorithm of optical fiber probe void fraction based on multi-sensor data fusion, and thenwe propose a new design of measurement system driver circuit of optical fiber probe voidfraction by digital signal processor (DSP).Firstly, the paper presents a fiber optic probe arrays structure that is targeted for themulti-sensor void fraction estimation problem of oil-gas-water three-phase flowcross-section radial void fraction with uneven distribution characteristics in verticalupward pipeline/tube. And we also have a research on the processing method of opticalfiber probe output signal, which combines the filtering algorithm of optical fiber probeoutput signal based on wavelet transform with the estimation algorithm of optical fiberprobe void fraction based on data fusion. On one hand, we are able to obtain the removalof the fiber-optic probe signal noise; on the other hand, we can also get the localestimation of single optical fiber probe void fraction and recursive estimation fusionprocessing of multi-fiber probe void fraction. finally, we achieve the time and spatialcross-section void fraction fusion estimation in vertical upward pipeline/tube.Secondly, in order to realize the problem of multi-fiber probe measurements and voidfraction estimation algorithm of multi-sensor data fusion under the conditions of hightemperature and high pressure in oil wells, we propose a new design of measurementsystem driver circuit of optical fiber probe sensor void fraction by digital signal processor,which can meet the requirements of multi-fiber probe sensor signal collecting under the oil wells, multi-sensor data fusion void fraction estimation, mass storage and datatransmission so on.Finally, combining measurement driver circuit of void fraction with multi-fiber probesensor void fraction estimation algorithm, implement a void fraction measuring system ofoil-gas-water three-phase flow in oil wells based on DSP， and building a oil-gas-waterthree-phase flow simulation device platform, and then using the measurement data ofoil-gas-water three-phase flow in different flow rates and different conditions to makeexperimental validations and comparative analysis of estimation results for the multi-fiberprobe sensor void fraction estimation method.