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本文研究了产生最小界面张力的油-盐水-石油磺酸盐体系的最佳配方和驱油效率。通过合成新的石油磺酸盐和选择混合醇和混合电解质的实验,使增溶参数由10提高到14,该微乳液体系同油或水的界面张力达到10~(-3)达因/厘米,达到美国埃克森(Exxon)生产研究公司的研究指标。由于增溶参数的提高,大大地节省了表面活性剂的用量。为了获得油-盐水-表面活性剂体系最佳配方的关系,研究了石油磺酸盐的平均当量、醇的链长和用量以及混合醇和混合电解质对增溶参数、最佳含盐量和低界面张力性质的影响。实验表明,随着醇的链长增加,增溶参数增加,最佳含盐量降低。当加入混合醇和混合电解质时,可在较宽的含盐量范围内获得低张力,因此扩大了对地层水含盐量范围的适应性。驱油实验表明,在最佳含盐量的条件下,采收率可提高30％,含水率由98％降到50％。当注入0.2孔隙体积、石油磺酸盐的浓度为5％时,采收率可提高20％。
In this paper, the optimal formulation and flooding efficiency of oil-brine-petroleum sulfonate system with minimum interfacial tension were studied. Through the experiment of synthesizing new petroleum sulfonate and selecting mixed alcohol and mixed electrolyte, the solubilization parameter was increased from 10 to 14, the interfacial tension of the microemulsion system reached 10 ~ (-3) dyne / cm with oil or water, Achieved the research index of the production and research company of Exxon in the United States. Due to the increase of solubilization parameters, the amount of surfactant is greatly saved. In order to obtain the optimal formulation of oil-brine-surfactant system, the average equivalent weight of petroleum sulfonate, the chain length and the amount of alcohol and the effect of mixed alcohol and mixed electrolyte on the solubilization parameters, the optimum salt content and the low interface The nature of tension. Experiments show that, as the alcohol chain length increases, the solubilization parameters increase, the optimum salt content decreased. When mixed alcohols and mixed electrolytes are added, low strains can be achieved over a wide range of salt contents, thus increasing the flexibility of the range of formation water salinity. Oil displacement experiments show that under the optimal salt content, the recovery rate can be increased by 30% and the water cut from 98% to 50%. When 0.2 pore volume is injected and the petroleum sulfonate concentration is 5%, the recovery can be increased by 20%.