络合剂改善无碱一元和二元复合驱油体系的增粘能力和油水界面性能

Increasing viscosity ability and oil and water interfacial property for polymer/surfactant flooding system improved by complexing agent

通过研究络合剂对部分水解聚丙烯酰胺（HPAM）和直链烷基甜菜碱（BH）粘度和油水界面张力的影响，探讨了在高矿化度条件下，利用络合剂作为助剂改善无碱一元和二元复合驱油体系增粘能力和油水界面性能的方法。结果表明，在NaCl，CaCl2和MgCl2的质量浓度分别为6500，890和520mg／L的矿化水中，质量浓度为50mg／L的络合剂就可以使质量浓度为1800mg／L的HPAM的粘度增加80％以上，可以使质量浓度为800-3000mg／L的直链烷基甜菜碱BH与原油的最低界面张力由10^-2mN／m数量级降低到超低水平，而且这种络合剂也可以使1800mg／LHPAM-800mg／LBH二元复合体系：老化30d的粘度增加40％以上，并使油水界面张力最低值由1．52×10^-2mN／m降低到6．06×10^3mN／m。通过考察粘度和油水动态界面张力随不同老化时间的变化规律，分析了络合剂的作用机制。

In this paper, it investigates the effect of complexing agent on the viscosity and oil-water interfacial tension of partially hy-drolyzed polyacrylamide HPAM and linear alkyl betaine BH systems, and discusses the method of utilizing complexing agent as addi-tive to improve the increasing viscosity ability and interfacial property of polymer and surfactant flooding system in high salinity reser-voir. It has been found that the viscosity of 1 800 mg/L HPAM may be increased by more than 80%, and the minimum of dynamic inter-facial tension between BH surfactant solution and crude oil may be reduced from 10-2mN/m magnitude to ultralow level by addition ofonly 50 mg/L complexing agent in salt water containing NaCl 6 500 mg/L, CaCl2 890 mg/L and MgCl2 520 mg/L respectively, which isalso suitable for HPAM and BH mixed system. By studying the variation of aging viscosity and dynamic interfacial tension, the actionmechanism of complexing agent is further analyzed.