Abstract:

Surfactant can be lost by adsorption on clay. So binary flooding does not have a good synergistic effect. The adsorption properties on montmorillonite of sulfobetaine-type fluorocarbon surfactant (FS) were studied by colorimetry. The adsorption conditions, such as alcohols, polyacrylamides (HPAM) of different molecular weights, pH and temperature were studied. The results showed that addition of 10% volume ratio of different types of alcohol, by adding methanol, ethanol, isopropanol and butanol reduced the adsorption amount on montmorillonite of the FS. Octanol, decanol, ethylene, glycol, glycerol increased the adsorption amount on montmorillonite of the FS. Ethanol reduced the adsorption capacity value of the FS by 67.25%, while octanol increased the adsorption capacity value of the FS by 86.76%.  So low molecular weight alcohols could reduce the adsorption amount of the FS on montmorillonite. HPAM could reduce the adsorption capacity on montmorillonite of the FS. As the HPAM concentration and molecular weight increased, FS adsorption on montmorillonite declined. HPAM with molecular weight of 20 million lowered FS adsorption on montmorillonite more obviously than that with molecular weight of 10 million. With the increase of pH, the adsorption capacity on montmorillonite of the FS decreased. FS adsorption on montmorillonite could be increased in acidic environments, but FS adsorption on montmorillonite could be decreased in alkaline environments. As temperature increased, the adsorption capacity on montmorillonite of the FS first increased and then decreased, with the maximum adsorption capacity at 40—50℃. X-ray diffraction (XRD) of montmorillonite treated with the FS indicated that the FS entered the clay, and increased the layer spacing of MMT.

摘要：

针对黏土吸附表面活性剂造成的损耗使得二元复合驱不能具有很好的协同效用，采用比色法研究了磺基甜菜碱型氟碳表面活性剂（FS）在钠基蒙脱土上的吸附性能，并考察了醇、部分水解的聚丙烯酰胺（HPAM）、pH值、温度对FS在钠基蒙脱土上吸附量的影响。结果表明：加入10%(体积)的不同种类的醇时，甲醇、乙醇、异丙醇、正丁醇降低FS在蒙脱土上的吸附，而辛醇、癸醇、乙二醇、丙三醇则增加FS在蒙脱土上的吸附，其中乙醇使FS吸附量降低67.25%，辛醇使FS吸附量增加86.76%；所以分子量相对较小的醇能降低FS