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通过21件原油样品实验分析表明,原油烃类中高分子量组分C40+(%)与原油黏度存在良好的相关性;利用油田开发取心检查井油砂制备得到油藏剩余油样品44件,通过高温色谱检测得到剩余油烃类低C21-、中C21～C40、高分子化合物C40+含量(%),利用原油黏度与烃类C40+(%)的关系式预测了剩余油黏度;结合油田开发取心检查井的岩石渗透率、含油饱和度等资料,对聚合物驱和水驱油藏剩余油的流动性特征、剩余油性质、下步驱油方式等进行研究.实验结果表明,聚合物驱和水驱2种驱油方式油藏剩余油的烃类组成、黏度和流度都呈现非均质性特征,且前者的非均质性更加明显;聚合物驱与水驱油藏相比烃类C21-(%)和C21～C40(%)较低、C40+(%)的较高,聚合物驱可能相对较多的采出原油的低等和中等分子量化合物,使聚合物驱剩余油中烃类C40+(%)增加、剩余油黏度变大、流度下降及流动性变差;水驱油藏剩余油以中黏油为主、有一定数量的低黏油,聚合物驱油藏剩余油以中黏油为主、有一定数量的高黏油;根据油藏剩余油黏度测定结果和流度比控制的最佳范围,确定不同油田及油藏剩余油的驱油方式和聚合物溶液黏度及浓度,为下一步油藏剩余油开发及提高采收率提供了新依据和新方法.
The experimental analysis of 21 crude oil samples shows that there is a good correlation between the C40 + (%) content of crude oil and the viscosity of crude oil. Using the developed oil well, 44 samples of remaining oil samples were obtained, The remaining oil viscosity C21-, C21 ~ C40, C40 + content (%) were determined by chromatographic method. The viscosity of remaining oil was predicted by the relationship between crude oil viscosity and hydrocarbon C40 + (%). Well permeability and oil saturation, the fluidity characteristics of residual oil in polymer flooding and waterflooding reservoirs, the characteristics of remaining oil and the oil displacement method in the next step are studied.The experimental results show that polymer flooding and water flooding Hydrocarbon composition, viscosity and fluidity of the remaining oil in the flooding two reservoirs show heterogeneity, and the heterogeneity of the former is more obvious. Compared with the water flooding reservoir, the hydrocarbon flooding of C21 - (%) and C21 ~ C40 (%) lower, C40 + (%) higher, the polymer flooding may be relatively more crude oil recovery of low and medium molecular weight compounds, polymer flooding remaining oil hydrocarbons C40 + (%) increase, the remaining oil viscosity becomes larger, the decline in flow and liquidity The remaining oil in the waterflooding reservoir is mainly medium oil with a certain amount of low-viscosity oil. The remaining oil in the polymer flooding reservoir is mainly medium oil with a certain amount of high-viscosity oil. According to the remaining oil in the reservoir Viscosity determination results and the optimal range of flow ratio control to determine the oil displacement method and polymer solution viscosity and concentration of remaining oil in different oil fields and reservoirs provide a new basis for the next remaining oil development and enhanced oil recovery And new method.