石油乳状液的黏度模型

在大量文献调研的基础上,总结了化学复合驱数值模拟中应用的石油乳状液黏度模型,包括黏度-含水率模型、黏度-剪切速率模型以及黏度-含水率-剪切速率模型。研究表明:化学驱中生成的乳状液的黏度受到多种因素影响,其中最为重要的是体系的含水率(或含油率)、剪切速率和温度;对于不同的含水条件,乳状液的黏度表达式不同;随着含水率的增加,将出现黏度突变的临界含水率,此临界点对应水包油型与油包水型乳状液之间的转变。建立了化学驱数值模拟软件中对应不同含水阶段的乳状液黏度模型。图4参13

Viscosity model of oil emulsion in chemical flood-ing

With the development of pilot test in synergistic chemical flooding, much attention were paid on that the non-Newtonian and thermodynamically unstable emulsion flow may potentially affect the process of the reservoir numerical simulation. Based on the study of many available literatures, viscosity models of emulsion liquid used in numerical simulation for chemical combination flooding are developed, including the viscosity-water content model, the viscos-ity-shear rate model and the viscosity-water content-shear rate model, showing that the viscosity of emulsion liquid produced in chemical flooding will be affected by many factors, in which the water content (or oil content), shear rate and the temperature are most important.The viscosity equations of emulsion flow will be different under dif-ferent conditions of water content. The viscosity of emulsion would be suddenly drawdown when the water cut is greater than its critical point, in which there is observable emulsion invert from water in oil to water in oil. Based on this research, the viscosity models, corre-sponding to different phases of water content, of oil emulsion used in mathematical model of chemical flooding processes are developed.