碱与乳化剂复合体系对稠油乳状液稳定性及流变性的影响

The Effect of Alkali and Emulsifier Binary System on the Stability and Rheological Property of Heavy Oil-in-Water Emulsion

考察了Na2CO3、非离子型乳化剂BJN-01、无机盐加量对水包稠油型乳状液分水率和表观黏度的影响,分析了复合体系对乳状液稳定性和流变性的作用规律及协同作用机理。结果表明,碱质量浓度为500 mg/L、乳化剂体积分数为0.5%时形成的乳状液最稳定,室温静置19 h的分水率为60.7%,且表观黏度较低,30℃与20.4 s-1下的表观黏度为86.2 m Pa·s;加入Na Cl使乳状液的稳定性降低,且盐浓度越高、分水率越大;当乳化剂体积分数为0.5%,碱加量在500~6000 mg/L时,随着碱浓度增加,乳状液的稳定性降低,表观黏度增加;当碱加量为500 mg/L,乳化剂体积分数在0.5%~0.9%时,随着乳化剂加量增大,乳状液的稳定性增强,表观黏度增加。

This work focused on the effects of concentrations of alkali Na2CO3,nonionic surfactant BJN-01 and inorganic salt on the dewatering ratios and the apparent viscosities of heavy oil-in-water emulsions. The action laws and synergistic reaction mechanism of the compound systems on the stabilities and rheological properties of emulsion were analyzed. The results showed that the emulsion with 500 mg/L alkali concentration and 0.5% emulsifier volume fraction was the most stable,and its dewatering ratio was 60.7% after standing for 19 h at room temperature. Furthermore,its apparent viscosity was lower,which was 86.2 m Pa·s at 30℃ and 20.4 s-1. But adding Na Cl into the system could reduce the stability of the emulsion. The higher salt concentration,the greater dewatering ratio was. For the system with 0.5% emulsifier volume fraction and 500—6000 mg/L alkali,the stability of emulsion decreased and its apparent viscosity increased with increasing dosage of alkali. However,for the system with 500 mg/L alkali and 0.5%—0.9% emulsifier volume fraction,the stability of emulsion strengthened and its apparent viscosity increased with increasing dosage of emulsifier.