摘要
本文从碳原子数分别为12、14、16的磺基羟基两性甜菜碱表面活性剂（新1#、新2#和新3#）中筛选出了适合长庆油田的表面活性剂新2#。在此基础上，以长庆油藏油砂为吸附剂，采用静态振荡吸附法在多级吸附之后分别测定了含浓度为1000、1500、2000 mg/L新2#表面活性剂的二元体系与原油间的界面张力，并对含不同浓度表面活性剂的二元体系多级吸附后的最大最小界面张力变化趋势进行了分析研究。结果表明：多级吸附最小界面张力变化趋势整体与Giles吸附等温线“S”型变化趋势相近；表面活性剂浓度越大，随吸附次数的增加多级吸附后最小界面张力值增加的越慢； 表面活性剂浓度越低，二元体系的最大、最小界面张力变化幅度越大；随着吸附次数的增加，变化幅度越来越小，且浓度越低，变化幅度降低的速度越快。驱替实验结果表明，1500 mg/L聚合物+2000 mg/L新2#表面活性剂的二元体系在水驱（25%） 基础上可提高采收率10%左右，使含水降低30%左右，可满足二元驱现场实施要求。
Abstract
At first, the betaine surfactants new 2# for the binary oil displacement system suitable for Changqing oilfield was chosen from the sulfosalicylic-hydroxyl amphoteric surfactant（new1#、new2# and new3#）, whose carbon atomic are 12, 14 and 16, respectively, by determining the interfacial tension between the Changqing crude oil and SP binary system containing 1500 mg/L HPAM and surfactant with different concentration. Using oil sand of Changqing reservoir as adsorbent, the interfacial tensions between the binary system with different surfactant concentration and the Changqing crude oil were determined by means of static oscillation adsorption after multilevel adsorption and the changing trend of interfacial tension was studied. The research results showed that The changing trend of minimum interfacial tension was the same as S-type of adsorption isotherm. With the increase of adsorption times, the higher the concentration of surfactant was, the more slowly the minimum interfacial tension increase. The lower the concentration was, the larger the changing range of interfacial tension was. With the increase of adsorption times, the range became smaller; and the lower the concentration was, the faster the decrease of the range was. The result of displacement experiments indicated that based on the water flooding (oil recovery being of 25%), the oil recovery was increased 10% by injecting the binary system containing 1500 mg/L HPAM and 2000 mg/L new2#, which met the demands of the SP binary flooding in Changqing oilfield.
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