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以玉米淀粉和2,3-环氧丙基三甲基氯化铵(ETA)为原料,氢氧化钠为催化剂,采用干法合成了高取代度阳离子淀粉(CS),并考察了其驱油性能。结果表明,当m(NaOH)/m(淀粉)=0.02,n(ETA)/n(淀粉)=0.33时,55℃下搅拌1 h,真空干燥4 h,阳离子淀粉的取代度及反应的转化率可分别达到30%和90%。室内模拟驱油实验中,矿化度为40g/L时5,g/L CS溶液能够提高原油采收率4.7%;10 g/L CS溶液驱替过程中有两次明显升压过程,最高压力可分别达0.044和0.041 MPa,并且原油的采收率可提高34.4%。驱油效果明显优于3 g/L部分水解聚丙烯酰胺(HPAM)溶液。实验用CS溶液的浓度大于PHPA溶液的浓度,但前者的总成本远低于后者,并且不会对环境造成污染。
Using corn starch and 2,3-epoxypropyltrimethylammonium chloride (ETA) as raw materials and sodium hydroxide as catalyst, a high degree of substitution cationic starch (CS) was synthesized by dry method and its oil displacement performance. The results showed that when m (NaOH) / m (starch) = 0.02 and n (ETA) / n (starch) = 0.33, stirring at 55 ℃ for 1 h and vacuum drying for 4 h, the degree of substitution and the conversion of cationic starch Rates can reach 30% and 90% respectively. In the simulated experiment of oil displacement in the laboratory, the g / L CS solution can improve the recovery rate of crude oil by 4.7% when the salinity is 40g / L. There are two obvious step-up processes in the displacement of 10 g / L CS solution, Pressure can reach 0.044 and 0.041 MPa, respectively, and oil recovery can be increased by 34.4%. Oil displacement was significantly better than the 3 g / L partially hydrolyzed polyacrylamide (HPAM) solution. The concentration of experimental CS solution is greater than the concentration of PHPA solution, but the total cost of the former is much lower than the latter, and will not cause environmental pollution.