Research On Gas-liquid Phase Velocity Measurement Of Oil-gas-water Three-phase Flow Based On Energy Demodulation Algorithm

The multiphase flow system is widespread in nature and industrial production. Andthe parameters detection of oil-gas-water three-phase flow is always one of the hot issuesof modern petroleum industry. It is of great importance to measure the oil-gas-watermultiphase flow parameters and the flow velocity measurement is one of the main topics.However, because of the complexity of the characteristic of the oil-gas-water three-phaseflow and the randomness of oil-gas-water multiphase flow process, it becomes difficult tomeasure the flow velocity parameter. Therefore, a method of gas-liquid phase velocitymeasurement of oil-gas-water multi-phase flow based on Energy Demodulation algorithmhas been studied in this paper. It provides a feasible method for accurate measurement ofgas and liquid phase velocity of oil-gas-water three-phase flow.Firstly, aiming at the inaccurate of two dimensions theoretical model of conductancesensor for reflecting response characteristics of the sensor, the three dimensions theoreticalmodel of conductance sensor is established. And the analysis of response characteristics ofthe conductance sensor is performed with reference to different oil bubble numbers anddifferent levels deviating from the axis. The verification of the superposition principle ofresponse characteristics provides the theoretical basis for gas and liquid phase separation.Secondly, a gas-liquid phase separation method of oil-gas-water multiphase flowbased on energy demodulation algorithm is proposed. The feasibility of this algorithm foroil-gas-water three-phase flow gas and liquid phase separation is discussed. Through thesimulation experiment the separation of mixture signal containing two components withdifferent degrees of overlap is realized, and these provide the full foundation for gas-liquidphase velocity measurement of oil-gas-water three-phase flow.Finally, the realization process of gas-liquid phase velocity measurement ofoil-gas-water three-phase flow based on energy demodulation algorithm is given. Theseparations of two oil-gas-water three-phase flow conductance signals which are collectedby six-electrode array correlation conductance are performed, so gas-water fluctuationsignal of the upstream, oil-water fluctuation signal of the upstream, gas-water fluctuation signal of the downstream and oil-water fluctuation signal of the downstream are obtained.After the time delay estimation for gas-water fluctuation signals and oil-water fluctuationsignals respectively, gas phase velocity and liquid phase velocity are derived.