大庆油田强碱三元复合驱表面活性剂配方优化

Composition Optimization of Surfactant Used for Alkali/Surfactant/Polymer Flooding in Daqing Oilfield

刘春天 罗庆 杨勇 陆屹 李欣欣 宋志瑞

LIU Chuntian LUO Qing YANG Yong LU Yi LI Xinxin SONG Zhirui

烷基苯磺酸盐表面活性剂的性能直接影响强碱三元复合驱的开发效果。通过研究原油组成、油砂吸附等对烷基苯磺酸盐表面活性剂浓度及强碱三元复合体系界面张力的影响，建立了原油分子量与表面活性剂当量之间的定量匹配关系。结果表明，依据该定量匹配关系选择合适当量的表面活性剂可使三元复合体系与大庆地区 不同原油间达到超低界面张力，提高了强碱三元复合体系的适应性；原油组成影响表面活性剂在油水相中的分配比例，原油中的沥青质含量越高，水相中的表面活性剂浓度越低，原油组成对表面活性剂当量的影响较小；油砂吸附改变了表面活性剂的当量及组成分布，导致三元体系中表面活性剂的浓度降低、三元体系界面张力升高，可采取增加高碳组分、调整表面活性剂当量的方法，扩大复合体系在地下运移过程中的超低界面张力作用距离。图11表3 参16

The performance of alkylbenzene sulfonate surfactant effected recovery efficiency of alkali/surfactant/polymer (ASP) flooding directly. The quantitative matching relation between crude oil molecular weight and surfactant equivalent was formed by studying the influences of oil component and sand adsorption on surfactant concentration and interfacial tension of alkali ASP system. The results showed that the appropriate surfactant based on the matching relation of quantitative selection guaranteed ultra-low interfacial tension between different oil in Daqing oilfield and ASP system, and improved the adaptability of ASP system. Distribution proportion of surfactant in oil and water was affected by oil component. The higher concentration of asphaltene in crude oil, the lower concentration of surfactant in aqueous phase was. Surfactant equivalent changed slightly with oil content. Sand adsorption reduced the concentration and changed the equivalent and distribution of surfactant, and increased the interfacial tension of ASP system. Surfactant equivalent could be adjusted by adding the content of high carbon which would expand the range of ultra-low interfacial tension during the movement of ASP system in reservoir.

10.19346/j.cnki.1000-4092.2016.04.027