阻抗式含水率计三相漂流模型校正的实验研究

Experimentation of Impendence Sensor Three-phase Drift Flow Model Emendation

多相流理论中经常采用的有均流模型、分流模型及漂流模型。漂流模型考虑了相间的滑脱影响及管道截面中混合物浓度分布和速度分布的影响,在油水两相含水率校正中获得广泛应用。通过对两相漂流模型的改进,将其应用于油气水三相流时阻抗式含水率的含水率校正,并在模拟井上进行了动态实验验证。将改进的漂流模型应用于阻抗式含水率计的油气水三相流测量校正,并采用线性拟合的方法确定相分布系数和油气泡绝对浮升速度,实验结果表明可以取得较高的校正精度,但是该模型适用于低含水、高产气情况,对于高含水、低产气情况,阻抗式含水率计的测量结果在不经校正的条件下可以满足测量精度要求。

We always adopt uniform fluid , separate fluid and drift flow model in multi-phase theory. The slippage between water phase and oil phase, the rate and concentration of oil-water mixture are considered in the drift model widely used in water-cut emendation of oil-water twophase flow. The drift model is ameliorated and used to emendate water-cut of impedance sensor for oil-gas-water. Dynamic experimentation is developed in multiphase loop. Distribution coefficient of phases and absolute floating velocity of oil-gas are determined with linear fitting method. Experiment result shows that the model can acquire high emendation precision. But it is only applicable for low water-cut and high gas production zones. As for high water-cut and low gas production zones, the impedance sensor may provide ideal measuring precision without any water-cut correction.