串并联管路条件下的油水两相流动综合模型

油水两相混合流动是油田开发过程中常见的流动形式。然而,目前的研究主要局限于单一恒径管道内,缺乏对并联或串联管路等复杂管路内流体流动的研究。本文基于管路串并联理论、流型转变准则、双流体模型和均相流模型,建立了复杂管路油水两相流动的综合模型,结合实例对该模型进行了验证,与数值模拟结果进行了比较。研究结果表明,该模型对油水两相在复杂管路中的分流情况和压降均表现出了良好的预测性,在两相体积含水率分别为0%~100%条件下,模型预测的绝对平均百分误差最高为14.4%,总体平均误差为9.8%。

A Comprehensive Model of Oil-Water Two-Phase Flow in Series/Parallel Pipeline

Oil-water two-phase flow in the complex pipeline, consisting of varying pipes and fittings in series / parallel, is commonly encountered in the petroleum industry. However, the study is mainly limited to single constant-radius pipe. In this paper, a unified model of oil-water two-phase flow in the complex pipeline is developed based on the combination of pipe serial-parallel theory, flow pattern transformation criterion, two-fluid model and homogenous model. A case is present to verify the unified model and to compare with CFD results. The results show that the unified model has a good performance on predicting both the flow distributions and pressure drops of oil-water two-phase flow in the complex pipeline. Compared with CFD results for water volumetric fractions ranging from 0% to 100%, the highest absolute percentage errors of the proposed model is 14.4% and the average is 9.8%.