粘弹性稠油的驱替特征及其影响因素分析

在粘弹性稠油一维两相驱替数学模型基础上，考虑影响稠油松弛特性的两个因素：温度和胶质-沥青质含量(体积分数），进行了数值求解,分析了松弛特性的影响因素及其对水驱稠油的影响。分析表明：温度越高，松弛特性越弱；胶质-沥青质含量越高，松弛特性越强，粘弹特性越显著；松弛特性可以降低驱替压力梯度，提高含水饱和度，推迟见水时间，延长开采时间，提高采收率，改善水驱粘弹性稠油的开发效果，但其影响随着温度的升高或胶质-沥青质含量的降低而减弱。研究成果为粘弹性稠油的驱替特征及其开发效果的研究提供了理论指导。

DISPLACEMENT CHARACTERISTICS OF VISCOELASTIC HEAVY OIL AND THE ANALYSIS ON INFLUENCING FACTORS

A onedimension two phases flooding mathematical model is established to describe the viscoelastic heavy oil displacement，which considers the two factors of temperature and pectinbitumen content and is solved with numerical method.The effects of influencing factors and relaxation property on the displacement of viscoelastic heavy oil are analyzed.The results show that，the relaxation property gets weaker as the temperature and pectinbitumen bulk fraction content gets higher.The higher the temperature and the less the pectinbitumen content，the weaker the relaxation property is.The property will decrease the displacement pressure gradient and increase the water saturation，delay the water breakthrough time and prolong the production time，which is helpful to improve the development efficiency.However，its function will weaken as the increase of temperature or the decrease of the content.The research result provides theoretical guidance for the research of displacement characteristics and development efficiency of viscoelastic heavy oil.