水平管道油-气-水三相段塞流动持液率模型研究

油-气-水三相段塞流型持液率预测往往先将油水两相看作混合均匀的单相，再利用气液两相方法进行计算。这种方法适用于油水混合均匀的段塞流型。但在低气液相流速下，油-气-水三相段塞流型中有时油水是分离的，此时如果使用上述方法，可能导致比较大的误差。研究建立了分离假塞流型（油基和水基）的平均持液率计算新模型。统计分析发现新建模型与实验数据吻合很好。在实验的基础上，将油-气-水三相段塞流型划分为油基／分离／段塞流、油基／分散／段塞流、水基份离／段塞流、水基份散／段塞流四种。研究四种流型表明，在其他条件不变的情况下，对于气液两相流动和分散／段塞流型，持液率随着液相折算速度或液相黏度的增加而增加，随着气相折算速度的增加而减少。但对油基／分离／段塞流和水基／分离／段塞流，持液率则随着气相折算速度的增加，先上升后下降。

Oil-gas-water three-phase slug flow liquid holdup model

Previous works usually used two-phase methods by considering oil and water phase as a homogenous mixture. In fact, sometimes oil and water are separated, so great errors will occur if using above method. A new holdup model of oilbased and water-based separated slug has been developed. Based on statistical analysis, the results were given by the new model agree well with the experimental data. According to experiments and relational documents, slug regime in oil-gas-water can be divided into oil-based separated slug, oil-based dispersed slug, water-based separated and water-based dispersed slug. Generally, liquid holdups increase with increasing of liquid converter velocity or liquid viscosity and decrease with increasing of gas converter velocity when other parameters will not change. But there are some differences between oil-based separated slug flow and water-based separated slug flow when velocity difference between oil film and water film, which will effect on liquid holdup greatly.