砂岩油藏双子表面活性剂渗吸配方研究

Formula Study of Gemini Surfactant Imbibition for Sandstone Reservoir

陈明贵 杨 光 王登科 石登科

CHEN Ming-Gui YANG Guang WANG Deng-Ke SHI Deng-Ke

本文评价了砂岩油藏低浓度双子表面活性剂（0.2%）渗吸提高采收率效果，考察了双子表面活性剂结构和配方对渗吸的影响。将岩心依次经地层水和原油自吸后放入表面活性剂溶液中测定，发现阳离子双子表面活性剂12-3-12不出油；阴离子双子表面活性剂AAAS采收率为37.27%；阴离子双子表面活性剂12-2-12和磺基甜菜碱C14AB复配后的采收率为38.8%；AAAS和月桂醇醚硫酸钠AES复配体系采收率达53.95%；脱水山梨醇单硬脂酸酯聚氧乙烯醚TW-60和AES复配后的采收率为60.2%。TW-60分子中的酯键不稳定，高温下容易水解断裂，因此选用AAAS和AES的基础配方。加碱（偏硼酸钠）配方渗吸采收率达到59.85% ，比无碱配方渗吸采收率高20.17%。室内一维均质岩心流动实验表明，双子表面活性剂渗吸配方比水驱提高采收率29.8%。

We evaluated dilute Gemini surfactant (0.2%) formulation for oil recovery in sandstone cores under high salinity, the effect of Gemini surfactant structure and its formula on enhanced oil recovery efficiency was studied. Sandstone core was saturated with imbibition by formation water and crude oil in turn, and then was measured in surfactant solution. The results showed that cationic Gemini surfactant 12-3-12 had no effect, the oil recovery of anionic Gemini surfactant AAAS, compounded system of anionic Gemini surfactant 12-2-12 and amphoteric surfactant C14AB, compounded system of AAAS and sodium laurite sulfate AES, compounded system of TW-60 and AES was 37.27%, 38.80%, 53.95% and 60.20%, respectively. Due to the instability of ester bond in TW-60 surfactant, the compounded system of AAAS and AES was used as basic formula. The imbibition recovery of the formula added alkaline (sodium metaborate) was 59.85%, which was higher than that of formula without alkaline by 20.17%. Indoor one-dimensional homogeneous core flood experiment result showed that anionic Gemini surfactant formulation had improved 29.8% oil recovery more than water flooding.