辛基酚聚氧乙烯醚羧酸钠对塔河稠油的降黏作用研究

Application of octylphenol polyoxyethylene ether carboxylate in viscosity reduction of Tahe heavy oil

通过丙酮溶剂法合成了降黏剂辛基酚聚氧乙烯醚羧酸钠(RJY-8),考察了其在不同条件下的热稳定性和耐盐性,降黏剂质量分数、油水比、温度对其降黏效果的影响,以及助溶剂、聚合物对它的降黏增效作用,得到了适应于塔河稠油的降黏配方。结果表明:RJY-8具有较高的热稳定性,在高盐地层水中仍能保持优异的界面活性;增大RJY-8用量、降低油水比以及升高乳化温度均可提高塔河稠油的降黏率;尿素及部分水解聚丙烯酰胺均可提高RJY-8的降黏效果,二者复配使用能降低降黏剂的成本。因此,选用RJY-8与部分水解聚丙烯酰胺、尿素复配作为塔河稠油的降黏配方。

The viscosity reducer alcohol polyoxyethylene ether carboxylate is synthesized using acetone as solvent. Its salt resistance and thermal stability under different conditions are investigated,and the effects of concentration,oil-water ratio and temperature on the viscosity reducing result of the viscosity reducer and the synergistic effects of the viscosity reducer with cosolvents and polymers are studied. The viscosity-reducing formulation suitable to Tahe heavy oil is obtained. The study results show that alcohol polyoxyethylene ether carboxylate has high thermal stability,and it can maintain excellent interfacial activity in high-salt formation water; increasing the concentration of alcohol polyoxyethylene ether carboxylate,decreasing oil-water ratio and rising emulsification temperature can improve its viscosity-reduction rate to Tahe heavy oil; urea and partially hydrolyzed polyacrylamide could increase the viscosity-reduction effect of alcohol polyoxyethylene ether carboxylate,and to use them as compound cosolvent can reduce the cost of the viscosity reducer. So the compound of alcohol polyoxyethylene ether carboxylate with urea and partially hydrolyzed polyacrylamide is the viscosity reducer formulation suitable to Tahe heavy oil.