硅酸盐复合黏弹性驱油剂的研究与评价

使用黏弹性表面活性剂形成具有一定黏弹性的蠕虫状胶束，所需原料的浓度较高，成本较高，制约了黏弹性表面活性剂驱油剂在现场的应用。以液体硅酸钠、两性表面活性剂、纳米二氧化硅为原料，制备了在经济使用浓度下能够显著提高注入水黏度且具有优良驱油性能的黏弹性驱油剂。透射电镜表征结果表明，驱油剂在有效质量分数为0.3%条件下即可达到较高的黏度。调整液体硅酸钠、表面活性剂的有效质量分数为0.12%~0.20%，制备的驱油剂的黏度达到10~50 mPa·s。实验对比了常用聚合物与黏弹性驱油剂的驱油效果，结果显示黏弹性驱油剂的驱油效果几乎是聚合物的2倍。这项工作为开发新型高效驱油剂提供了新方法，也为驱油剂流变学研究提供了新思路。

Research and evaluation of silicate composite viscoelastic oil displacement agent

Using viscoelastic surfactant to form worm like micelles with certain viscoelasticity requires high concentration of raw materials and high cost which restricts the application of viscoelastic surfactant oil displacement agent in the field.Using liquid sodium silicate，amphoteric surfactant and nano silica as raw materials，a viscoelastic oil displacement agent which could significantly improve the viscosity of injected water at economic concentration and had excellent oil displacement performance was prepared.The TEM characterization results showed that the oil displacement agent could achieve high viscosity when the effective mass fraction was 0.3%.By adjusting the effective mass fraction of liquid sodium silicate and surfactant to 0.12%~0.20%，the viscosity of the prepared oil displacement agent reached 10~50 mPa·s.The results showed that the oil displacement effect of viscoelastic oil displacement agent was almost twice of polymer. This work provided a new method for the development of new high?efficiency oil displacement agents，and also provided a new idea for the rheological study of oil displacement agents.