应用统计热力学模型研究温度对润湿指数的影响  

Applying statistical thermodynamic model to study the effect of temperature on the wetting index.

作　　者：卢贵武[1] 关继腾[1] 

机构地区：[1]石油大学

出　　处：《石油勘探与开发》1999年第2期95-98,共4页Petroleum Exploration and Development

摘　　要：在对油藏进行注水开发时，由于注入水可能改变油层温度场，因此研究温度对润湿指数的影响有重要意义。利用统计热力学模型，推导出润湿指数与温度的关系式，据此计算了当固体、水以及水的饱和蒸气三相平衡时的接触角，研究了温度对润湿指数的影响。利用分布函数理论及计算机模拟数据计算了水的表面张力与温度、压强的定量关系，计算结果与实验结果基本一致。研究了温度对固／水／油三相体系润湿指数的影响，发现当体系的温度达到某临界温度以后，固体表现出强烈的亲水性，固体表面的油相将完全被水相替代，介质中的剩余油饱和度将大大降低。研究结果表明，升高注入水的温度能提高水在固体表面的润湿指数，有利于降低剩余油饱和度。表３参１０（卢贵武摘）In the development of oil field under water flooding, water injected will change the heat field of the reservoir formation, and therefore a study of the effect of temperature on wetting index of reservoir will have an important significance. By means of a statistical thermodynamic model a formula describing the relation between the temperature and wetting index is derived to estimate the contact angle when solid surface, water and water vapor are in an equilibrium condition, and effect of temperature on the wetting index is determined. By an application of theory of distribution function and computer simulation data surface tension of water and its quantitative relation with temperature and pressure are calculated, the results of calculation coincides with experiment remaining oil. A study of the effect of temperature on a solid/water/oil 3 phase system reveals that solid surface shows strong water wettability when certain critical temperature is reached, oil on the solid surface will be driven off completely by water, and the remaining oil saturation will be reduced greatly. The results of study show that increasing the temperature of injected water will raise the wetting index of water on the solid surface and is beneficial to the reduction of

关 键 词：统计热力学 模型 温度 润湿指数 油气层 

分 类 号：TE319[石油与天然气工程—油气田开发工程]