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通过室内实验方法研究了钠蒙脱土颗粒对聚驱采油污水油水分离性能和油水界面性质的影响。采用界面张力仪和Zeta电位仪研究了钠蒙脱土颗粒对聚驱采油污水中油滴Zeta电位、油水界面张力和界面扩张黏弹模量的影响。在光学显微镜下,观察钠蒙脱土颗粒在油滴表面的吸附状态。结果表明,当钠蒙脱土颗粒质量浓度低于200 mg/L时,随其质量浓度增大、Zeta电位下降,、界面张力降低、黏弹模量提高,采油污水中出现稳定液滴型(oil-mineral aggregate,OMA)结构,此时钠蒙脱土颗粒对聚驱采油污水稳定性影响比较显著,采油污水处于比较稳定的阶段。当其质量浓度大于250 mg/L后,Zeta电位基本不再下降,而界面张力略有提高,黏弹模量也有增大,颗粒油滴形成大的聚集体结构,油滴更容易发生聚并,聚驱采油污水稳定性变差,从而更易于处理。
The effects of sodium montmorillonite particles on the oil-water separation performance and oil-water interfacial properties of ASP flooding wastewater were studied by laboratory experiments. The effects of sodium montmorillonite particles on Zeta potential, oil-water interfacial tension and interfacial viscoelasticity of oil droplet in ASP flooding were studied by interfacial tension meter and Zeta potential meter. Under an optical microscope, the adsorption state of sodium montmorillonite particles on the oil droplet surface was observed. The results showed that when the mass concentration of sodium montmorillonite particles was less than 200 mg / L, the Zeta potential decreased, the interfacial tension decreased and the viscoelastic modulus increased with the increase of mass concentration of sodium montmorillonite. The stable droplet type oil-mineral aggregate (OMA) structure. At this time, the effect of sodium montmorillonite particles on the stability of ASP flooding was significant, and the production wastewater was at a relatively stable stage. When the mass concentration is more than 250 mg / L, the Zeta potential is no longer decreased, but the interfacial tension increases slightly, the viscoelastic modulus also increases, and the granular oil droplets form a large aggregate structure, and the oil droplets are more likely to aggregate , Polymer flooding sewage stability deteriorated, which is easier to handle.