高性能耐温耐盐阳/阴离子表面活性剂复合型驱油体系性能的研究

Properties of Compound Flooding Systems with Temperature-Tolerant and Salt-Resistant Cationic/Anionic Surfactants

采用十六烷基三甲基氯化铵（1631）、仲烷基磺酸钠（SAS60）、脂肪醇聚氧乙烯醚（AEO-9）、乙醇和碱剂等制备阳/阴离子表面活性剂复合型驱油体系（CA）,考察了阳/阴离子表面活性剂配比、用量、温度、矿化度等因素对CA性能的影响。实验结果表明,表面活性剂的最佳配比为m（1631）∶m（SAS60）∶m（AEO-9）=1.5∶32∶8;45℃时,CA耐Na Cl达到110 g/L,耐Ca2＋达到5 g/L;对CA含量为0.3%（w）的模拟地层水,在20~80℃下模拟地层水与模拟油的界面张力达到低界面张力范围（0.01~0.001m N/m）,油砂吸附5 d后油水界面张力达0.002 8 m N/m,乳状液静置12 h后析水率仅为25%,在水驱基础上提高采收率11%以上。

Compound cationic/anionic surfactant flooding systems（CA） were prepared from cetyltrimethylammonium chloride（1631）,secondary alkane sulfonate（SAS60）,fatty alcohol polyoxyethylene ether（AEO-9）,ethanol and alkaline agent. The effects of cationic/anionic ratio,temperature and degree of mineralization on the performances of CA were studied. The results showed that,under the optimal surfactant ratio of m（1631）∶m（SAS60）∶m（AEO-9） 1.5∶32∶8,the resistances of CA to Na Cl and Ca2＋ were 110 g/L and 5 g/L at 45 ℃,respectively. In the simulated formation water with CA content 0.3%（w）,the oil-water interfacial tension was low（0.01-0.001 m N/m） in the temperature range of 20-80 ℃. The oil-water interfacial tension reached 0.002 8 m N/m after the absorption of oil-sands 5 d. The water segregation rate of the emulsion prepared from CA and simulated oil was 25% after standing 12 h. The oil recovery can be improved by more than 11% through using the fl ooding system.