垂直管中气-水-泡沫三相管流空隙率实验研究

空隙率是计算气-水-泡沫三相管流压力、温度的重要参数,准确预测气井中气-水-泡沫三相管流空隙率大小对泡沫排水采气工艺技术的高效实施及方案优化至关重要。目前关于气-水两相管流空隙率模型研究较多,而气-水-泡沫空隙率研究相对薄弱。因此本文通过开展气-水-泡沫三相空隙率测量实验,研究了泡排剂浓度、气量、液量对空隙率大小的影响规律。基于漂移模型,考虑泡排剂浓度、气液表观流速、密度、滑脱速度等参数,建立了适用于垂直管的气-水-泡沫三相管流空隙率模型,并分别利用145组实验数据和602组文献数据验证了模型的准确度,预测实验数据时平均相对误差2.24%,平均绝对误差2.47%,预测文献时平均相对误差-4.65%,平均绝对误差为6.21%,证明新模型计算精度较高,可满足工程需求,新模型的提出可为泡沫排水采气工艺技术的高效实施和方案优化提供理论指导。

Study on Void Fraction of Gas-Water-Foam Three Phase Flow in Vertical Pipe

The void fraction is an important parameter for predicting the pressure and temperature of gas-water-foam three phase pipe flow. Accurate prediction void fraction of gas-water-foam three phase pipe flow is very important for efficient implementation and optimization of foam drainage gas recovery. Studies on void fraction have focused primarily on gas-water pipe flows, while gas-water-foam pipe flows have neglected. In this study, a detailed experimental analysis of the void fraction of the gas-water-foam pipe flows in a vertical upward pipe was conducted with a pipe having an inner diameter of 50 mm. The effect of foam agent concentration, gas velocity, liquid velocity on void fraction was studied. In addition, a new void fraction model that takes into consideration the foam agent concentration, gas velocity, liquid velocity, density and drift velocity was established based on the drift ?ux model. To assess the reliability of the new model, 145 experimental data points and 602 groups of literature data are used to verify the accuracy of the model. When the new model was used for predicting void fraction of experimental data points, the average relative error was 2.24%, and the average absolute error was 2.47%. The average absolute error is -4.65%, the mean absolute error was 6.21% when it was used for published article data points, which proves that the new model has high calculation accuracy and can meet the engineering needs. The new model can provide theoretical guidance for the efficient implementation and optimization of the technology of foam drainage gas recovery.