无碱表面活性剂-聚合物复合驱技术研究进展

无碱表面活性剂-聚合物二元复合驱可避免碱引起的结垢、乳化、腐蚀等负面作用,降低投资和操作成本,是具有应用前景的化学驱提高石油采收率新技术。目前存在主要问题有:缺少高效稳定的活性剂工业化产品,驱油机理及主要影响因素理论研究薄弱,评价方法不健全,矿场试验少、技术风险较大。影响表面活性剂-聚合物二元复合驱驱油效率的主要因素有体系黏度、界面张力、乳化强度等,二元体系具有较高的黏度是提高采收率的重要保障,体系油水界面张力越低驱油效率越高,体系乳化性能也显著影响驱油效果。表面活性剂-聚合物二元复合驱矿场试验取得了一定效果,但也暴露出一些问题,需要提高配方适应性、驱油剂产品质量稳定性,优化注入方案,加强现场监测和跟踪调整等。

The progress in the alkali-free surfactant-polymer combination flooding technique

Alkali-free surfactant-polymer SP flooding can avoid scaling, strong emulsification and corrosion caused by alkali, thus reducing the investment and operating cost. It is a new chemical flooding technology for Enhanced Oil Recovery (EOR) with a promising application prospect. The main problems of SP flooding are as follows: shortage of industrialized surfactant product of high performance, weak theoretical research on oil displacing mechanisms and main influencing factors, unsound evaluation methods, lack of pilot tests, and high technical risk. The main factors that affect the oil displacement efficiency of SP flooding are displacing fluid viscosity, interfacial tension, and emulsification strength of SP system. The high viscosity of SP flooding formula system is an important guarantee of EOR process. The lower the interfacial tension, the higher the oil recovery degree. The emulsifiability of SP system can significantly affect efficiency of oil displacing. SP flooding process has obtained certain effects in pilot tests but there are still some problems. The formula adaptability and quality stability of surfactant product should be improved, the injection program should be optimized, and the field monitoring and process tracking and regulation should be strengthened.