乳化作用对水驱后残余油膜效果的实验与评价

Effect of Emulation on Displacement of Residual Oil Film Following Waterflooding:Experiment and Evaluation

驱油剂与原油间的乳化能力对化学驱的驱油效率有重要影响。在自行设计的人造残余油膜模型的基础上,筛选活性驱油剂对人造油膜进行驱替试验,实现了对乳化驱油效果的量化,为活性驱油体系的乳化驱油能力提供了评价指标。试验结果表明,驱油剂与原油的乳化过程能有效剥离油膜,适合在高含水阶段进一步提高驱油效率;乳化能力与油膜驱替效率间有很好的正相关关系,驱油剂的乳化能力决定其油膜驱替效率。通过分析证明界面张力并不能作为评价乳化能力的唯一标准,进一步完善了现有的乳化提高微观驱油效率的机理。

Emulsion ability between oil displacement agent and crude oil has a great influence on oil displacement efficiency of chemical flooding.This paper presents an artificial residual oil film model for screening activity of oil displacement agent and testing the effect on the oil film displacement,makes a quantitative of the emulsifying effect and provides the reasonable index for evaluating the emulsion displacement ability of surfactant.The experimental results show that the the emulsion process between oil displacement agent and crude oil can strip oil film effctivelly,suitable for further enhance of sweep efficiency at stage of high water cut.There exists very good positive correlation between the emulsion ability and oil film sweep efficiency.It is indicated that interfacial tension is not the only key influencing factor for evaluating the emulsion ability,which provides a further improvement for the mechanism of emulsion to enhance the microscopic oil displacement efficiency.