原位微乳液驱微观驱油实验研究

Experiment Study on Microscopic Oil Displacement of Situ Microemulsion Flooding

黎锡瑜 刘艳华 安俊睿 程兰嘉 贾彦勇 林硕 张燕

LI Xiyu LIU Yanhua AN Junrui CHENG Lanjia JIAYanyong LIN Shuo ZHANG Yan

针对双河油田IV上层系高温、特高含水油藏条件，为提高剩余油开采程度，开展了基于阴-非离子与阴离子羧酸盐复配表面活性剂（B-1）和单芳烷基磺酸盐表面活性剂（A3-2）的原位微乳液驱油研究，分析对比了原位微乳液与表面活性剂/聚合物二元复合驱的驱油作用，利用高温高压微观可视化模拟系统，研究了原位微乳液驱过程中的剩余油启动及运移方式、驱替效果及微观驱油机理。研究结果表明，3% A3-2 和3% B-1 能形成超低界面张力（10-4mN/m数量级），可与原油原位（即少量驱动力下）形成微乳液，增容参数大于20。A3-2 溶液能与原油原位形成中相微乳液，B-1 溶液能与原油原位形成下相微乳液。原位微乳液驱的驱油效果好于表面活性剂/聚合物二元复合驱。A3-2 溶液的增溶能力好于B-1 溶液，剩余油启动效果最好，微观驱油效果最佳。原位微乳液驱主要依靠表面活性剂的增溶作用，在多孔介质中与原油原位形成微乳液，从而达到混相驱油的作用效果；当原油在微乳液的胶束中增溶达到饱和时，进一步通过乳化携带、降低油水界面张力和改善润湿性等机理，优先启动簇状及斑状剩余油，使各种类型的剩余油都得到有效启动运移。图6 表2 参12

Aiming at ultra-high water cut and high temperature reservoir in IV layers of Shuanghe oilfiled，a study carried out in situ microemulsion flooding with anionic-nonionic and anionic carboxylate compound surfactant B-1 and alkyl sulfonate surfactant A3-2. The oil displacement effect was compared between situ microemulsion flooding and surfactant/polymer binary compound flooding. The distribution characteristics of remaining oil，the microscopic oil displacement efficiency and mechanism of oil displacement in the process of situ microemulsion flooding were also studied by using high temperature and high pressure micro visual simulating technique. The results showed that 3% A3-2 or 3% B-1 solution had ultra low interfacial tension（10-4 mN/m magnitude）and the property of situ forming microemulsion with crude oil，which had the solubilization parameter up to 20. A3-2 solution could form the middle phase microemulsion with crude oil in situ，and B-1 solution could form the lower phase microemulsion with crude oil in situ. The oil displacement efficiency of situ microemulsion flooding was better than that of surfactant/polymer compound flooding. A3-2 solution had better solubilization capacity and microscopic oil displacement effect than B-1 solution. The situ microemulsion flooding relied mainly on the solubilization between the surfactant and crude oil and formed microemulsion in the porous media，as a result，achieved the effect of miscible flooding. The flooding system could further improve oil recovery with the mechanism of carrying through emulsification，reducing the oil-water interfacial tension，improving core wettability and so on when the crude oil in micellar microemulsion solubilization reached saturation. In this process，clusters and porphyritic of residual oil were firstly removed，and ultimately the various types of remaining oil were effectively removed.

10.19346./j.cnki.1000-4092.2017.01.028