摘要
通过实验和模型计算,研究了CO_2对原油的降粘效果,结果表明,CO_2对原油有很好的降粘作用;在泡点压力以上,原油粘度随压力的减小而减小,在泡点压力以下,原油粘度随压力的减小而迅速增大,同时,随着CO_2注入摩尔分数的增大,原油粘度随压力的变化幅度减小;对于特定油田油样,饱和压力下相对粘度与CO_2注入摩尔分数成近线性关系,且对不同油样其斜率是近似相同的。与现有的粘度计算模型相比,改进的LBC模型计算精度更高,特别是高温条件下结果更为理想,可用于计算CO_2-原油多组分体系的粘度。
Through experiments and model simulation,the viscosity reduction of oil by CO_2 was researched.The result indicates that the reduction of viscosity by CO_2 is an important factor on improving the oil recovery.Above the bubble point,the oil viscosity reduces with the pressure decreasing;below the bubble point, the oil viscosity increases rapidly with the pressure decreasing.The oil viscosity decreases with the change of pressure and the increase of injected CO_2 mole fraction.For the specific oil sample in oilfield,relative viscosity and injected CO_2 mole fraction have linear relation nearly at saturation pressure.The slope is nearly the same for various oil samples.Compared with the existing models of viscosity,the advanced LBC model has better precision,especially for high temperature conditions.It can be applied to the calculation of the viscosity of CO_2-crude oil multi-component system.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2009年第3期82-84,共3页
Petroleum Geology and Recovery Efficiency
关键词
CO2
降粘
实验
模型预测
CO_2
viscosity reduction
experiments
model forecast
