Online horizontal oil-gas-water three-phase flow rate monitoring is essential for reliable operations during industrial production. A flow rate measurement method is developed in horizontal oil-gas-water three-phase flows by combining a blind tee, a Venturi meter, and a gamma-ray densitometer. The blind tee is installed at the test section entrance to homogenize the mixture by transforming the horizontal flow to a vertical upward flow. The Venturi meter is used for the total flow rate measurement. The dual-energy gamma-ray densitometer is used for phase holdup measurement. In the present method, blind-tee mixing effects and oil-water mixture slip behavior is essential, which were experimentally analyzed in this work. The phase inversion was found in the oil-water mixture with the increasing of the oil volume fraction. Besides, the addition of the gas reduces the oil-water slip ratio. For the range of 0–35% and 65–100% oil fraction in the oil-water liquid, the oil-water mixture can be well treated as a pseudo homogenous liquid with a slip ratio of 0.9–1.1. A three-phase flow rate model is then established for these conditions. The method was validated by horizontal oil-gas-water three-phase flows with average relative errors of 3.2% for the total flow rates, 4.3% for the gas flow rates, 11.5% for the oil flow rates, and 7.8% for the water flow rates.

在线水平油气水三相流量监测对于工业生产过程中的可靠运行至关重要。通过组合三通，文丘里计和伽马射线密度计，在水平油气水三相流中开发了一种流量测量方法。盲三通安装在试验段入口处，通过将水平流动转变为垂直向上流动来使混合物均匀。文丘里流量计用于总流量测量。双能伽马射线密度计用于相位保持测量。在本方法中，盲三通混合效应和油水混合物滑移行为是必不可少的，在这项工作中进行了实验分析。随着油体积分数的增加，在油水混合物中发现了相转化。除了，气体的加入降低了油水滑移率。对于油水液中含油率为 0%～35% 和 65%～100% 的范围，油水混合物可以很好地处理为滑移率为 0.9～1.1 的拟均质液体。然后为这些条件建立三相流速模型。该方法经水平油气水三相流动验证，总流量平均相对误差为3.2%，气体流量平均相对误差为4.3%，油流量平均相对误差为11.5%，水平均相对误差为7.8%流量。