Numerical Simulation And Experiment Study On Swirled Sampler Along The Circumference

Gas-liquid two-phase flow has emerged in many fields especially in the petroleum field. the measurement of flow rate is inevitable during the process of oil and gas field exploration. The two-phase flow measurements have always been the biggest obstacle to the exploration of oil and gas field based on the fact that the traditional two-phase measurements have a great number of defects such as bulky, expensive and off-line, etc. Under such circumstance,The extracting and separating method has been paid great attention considering its numerical advantages including small volume of device, high accuracy of measurement, on-line measurement, etc.The principle of EMS is that separating a fraction of flow in the mainstream firstly, and then separating and metering the subfraction using the metering separator and the one-phase flow meter respectively, at last figuring out the mainstream flow rate according to the relationship between the mainstream and the subfraction. Sampling distribution device is the key part of EMS. So this paper carries out optimal design and experimental research on the swirling sampling distributor with the help of numerical simulation and experiments. The numerical simulation is realized by the Fluent software and implemented with swirling sampling distribution device's structure, including the position of swirling vane ,the new kind of rectifier , the number, the size,the shape of the sampling hole, and location of openings on the circumference of the sampling hole. The result indicates that the sample is uniformity and stability when swirling vanes are installed at a distance of 75mm~100mm away from the inlet of rectifier and the curvature radius of arc-shaped rectifier is 25mm,at the same time there are eight sampling round holes of 5mm diameter as well as the holes located 50mm away from the rectifier outlet.The experiment is carried out at the multiphase loop system of the China university of petroleum Qindao campus. The related media are air and water. The relationships between extraction ratio and the mainstream flow rate have been obtained through the experiment as well as the branch resistance, the flow pattern and the resistant elements'impact on the extraction ratio. Finally The mainstream liquid and gas flow rates between true value and calculated value are also compared The results explain that the liquid extraction ratio is relatively stable in a wide range of flow near 0.1191. And the gas extraction ratio is linear with the liquid flow rate of the mainstream and has nothing with the mainstream gas flow rate. The average error of the liquid and gas flow rate measurement approach to 2.74% and 7.67% respectively.