多孔介质内水包油型乳状液非等温流动表征及敏感因素

Characterization and sensitive factors of non-isothermal flow of oil-in-water emulsion in porous media

为研究稠油乳状液在多孔介质内的非等温运移规律及影响因素,在多孔介质简化为变径毛细管束模型的基础上,将处于平衡状态的水包油型乳状液非等温流动传热过程转化为含有负内热源的稳态导热过程。同时,考虑温度的沿程变化及其对分散相黏度及界面张力的影响,建立水包油型乳状液在多孔介质中的非等温流动计算模型。水包油型乳状液非等温流动敏感性分析计算结果表明:随蒸汽注入温度的降低,注入端压力逐渐增大,沿程压力下降平缓段与快速下降线性段的转换位置向注入端移动;分散相黏度越大,水包油型乳状液滴通过孔喉所需的压力梯度越大,注入端压力越高;随分散相体积分数的增加,沿程温度下降加快,注入端压力逐渐升高。

In order to study the non-isothermal flow characterization and influencing factors of heavy oil emulsions in po⁃rous media,the porous media is simplified into a model of variable diameter capillary tube bundle,and then the non-iso⁃thermal heat transfer process of the oil-in-water emulsion in the equilibrium state is converted into a steady heat transfer process containing a negative internal heat source.At the same time,considering the variation of temperature along the way and its effect on viscosity and interfacial tension of the dispersed phase,a calculation model for the non-isothermal flow of oil-in-water emulsion in porous media is established.The calculation results of sensitivity-analysis of non-isothermal flow of oil-in-water emulsion show that the inlet pressure increases with the decline of steam injection temperature,and the transition position between the gentle pressure drop section and the fast-decline linear section moves to the injection point;the larger the viscosity of the dispersed phase,the larger the pressure gradient required for the oil-in-water emulsion drop⁃lets to pass through the pore throat,and the higher the injection end pressure.With the increase of the volume fraction of the dispersed phase,the temperature drops faster along the way,and the pressure at the injection end gradually increases.