Abstract:

In order to study and determine the optimal compounding system that can improve the stability of heavy oil emulsion in Liaohe Oilfield and the law of emulsion stability under different conditions, a focused beam reflectometer(FBRM) and rheometer were used to pass four factors and three levels. Orthogonal experiment with three indexes explored the change law of droplet average particle size, dispersion degree and emulsion viscosity, and investigated the influence of external factors on the stability of emulsion under compound system. The results show that the compound emulsifiers with the mass fractions of OBS?50, AEO15/OS?15, OP?15, and sodium with mass fraction of 4.0%, 4.0%, 1.4% and 1.4%, respectively, are the most beneficial to improve Stability of heavy oil emulsion in Liaohe Oilfield; there is a positive synergy between average particle size and dispersion, and an inverse relationship with the viscosity of the emulsion; the increase in temperature, volume ratio of oil to water will weaken the stability of the emulsion; stirring rate, ore The increase of the degree of chemical conversion can improve the stability of the emulsion; when the mass fraction of the mineralized NaCl is 0.2% to 1.0%, the stability of the emulsion can be greatly improved, and the quality fraction of the emulsion can be further improved. The lifting effect is not obvious.

Key words: Heavy oil, Stability, Average particle size, Dispersion

摘要：

为确定能够提高辽河油田稠油乳状液稳定性的最优复配体系以及在不同条件下乳状液稳定性的变化规律，利用聚焦光束反射测量仪（FBRM）、流变仪，通过四因素三水平的正交实验，探究了液滴平均粒径、分散度、乳状液黏度的变化规律，考察了外部因素对复配体系下乳状液稳定性的影响。结果表明，OBS?50、AEO15/OS?15、OP?15、十二烷基苯磺酸钠的质量分数分别为4.0%、4.0%、1.4%、1.4%的复配乳化剂有利于提高辽河油田稠油乳状液的稳定性；平均粒径与分散度存在正协同关系，与乳状液黏度存在反比关系；温度、油水体积比的提升，会降低乳状液的稳定性；加大搅拌速率及矿化度，有利于提高乳状液的稳定性；矿化物NaCl的质量分数为0.2%～1.0%时，能较大幅度地提升乳状液稳定性，进一步提高其质量分数对乳状液稳定性的提升效果不明显。

关键词: 稠油, 稳定性, 平均粒径, 分散度