两种石油酸对二元驱油体系关键性能的影响*

Influence of Two Petroleum Acids on the Key Performance of Binary Oil Displacement System

王 雨 吴永花 林莉莉 于文芳

WANG Yu WU Yonghua LIN Lili YU Wenfang

为明确原油中石油酸对复合驱油体系界面张力和乳化性能的作用规律，以复合驱试验区原油为原料分离 出两种石油酸和除酸油，分析了两种石油酸的结构和碳数分布，研究了其对二元驱油体系动态界面张力和乳状 液稳定性的影响。结果表明，1#石油酸和2#石油酸的相对分子质量分别为242和312，其碳数分布分别为10～15 和10～25。700 mg/L的2#石油酸可使油水平衡界面张力（IFTeq）降为0.021 mN/m，而同浓度的1#石油酸仅能使 IFTeq降为0.095 mN/m。混合酸对降低界面张力有正向协同作用，两种石油酸复配可使二元驱油体系的油水界面 张力达到超低。含酸体系的乳液稳定性与油水动态界面张力相关联，含2#石油酸的油水乳状液体系的IFTeq较 低，乳液的最终稳定性较高。通过对二元驱油体系性能与原料物性参数的分析，指出可以提高原料油石油酸含 量来合成二元驱用磺酸盐，以增加二元驱油体系的乳化性能，获得较好的降低油水界面张力效果。图9表3参12

In order to clarify the law of petroleum acid on the interfacial tension and emulsifying performance of binary oil displacement system（SP），two kinds of petroleum acids and oil with acid removed were separated from crude oil in compound flooding test area. The carbon number distribution and structure of two petroleum acids were tested，and the influence on dynamic interfacial tension and emulsion stability of SP were studied. The results showed that the relative molecular mass 1# and 2# petroleum acid was 242 and 312，while the carbon number distribution was distributed between 10—15 and 10—25，respectively. The 2# petroleum acid with mass concentration of 700 mg/L could reduce the equilibrium interfacial tension（IFTeq）between oil and water to 0.021 mN/m，while 1# petroleum acid with the same concentration could only reduce IFTeq to 0.095 mN/m. The mixed acid had a positive synergistic effect on reducing interfacial tension. The combination of two petroleum acids could achieve ultra-low oil-water interfacial tension in SP. The stability of acid-containing emulsion system was related to the dynamic interfacial tension. The final stability of the oil-water emulsion system containing 2# petroleum acid was higher due to the low IFTeq. Through the reverse analysis from the performance to raw materials of SP，it was pointed out that the sulfonate should be prepared by adding petroleum acid to raw oil，which increased the emulsification performance of SP and obtained a better effect of reducing interfacial tension.

10.19346/j.cnki.1000-4092.2021.03.019