A venturi device is commonly used as an integral part of a multiphase flowmeter (MPFM) in real-time oil-gas production monitoring. Partial flow mixing is required by installing the venturi device vertically downstream of a blind tee pipework that conditions the incoming horizontal gas-liquid flow (for an accurate determination of individual phase fraction and flow rate). To study the flow-mixing effect of the blind tee, high-speed video flow visualization of gas-liquid flows has been performed at blind tee and venturi sections by using a purpose-built transparent test rig over a wide range of superficial liquid velocities (0.3–2.4 m/s) and gas volume fractions (10–95%). There is little ‘homogenization’ effect of the blind tee on the incoming intermittent horizontal flow regimes across the tested flow conditions, with the flow remaining intermittent but becoming more axis-symmetric and predictable in the venturi measurement section. A horizontal (blind tee) to vertical (venturi) flow-pattern transition map is proposed based on gas and liquid mass fluxes (weighted by the Baker parameters). Flow patterns can be identified from the mean and variance of a fast electrical capacitance holdup measured at the venturi throat.

在实时油气生产监控中，文丘里装置通常用作多相流量计（MPFM）的组成部分。通过将文丘里管装置垂直安装在三通盲管的下游，需要进行部分流混合，以调节进入的水平气液流（以准确确定各个相的分数和流速）。为了研究盲三通的混流效果，已使用专用的透明测试装置在各种表观液体速度范围内对盲三通和文丘里管段进行了气液流动的高速视频流可视化处理（ 0.3–2.4 m / s）和气体体积分数（10–95％）。在测试的流动条件下，盲三通对进入的间歇性水平流动状态几乎没有“均质化”作用，流量保持间歇性，但在文丘里管测量部分变得更加轴对称且可预测。根据气体和液体的质量通量（由贝克参数加权），提出了水平（盲三通）到垂直（文丘里）流型转换图。可以根据在文丘里喉管处测得的快速电容保持率的平均值和方差来确定流量模式。