原位微乳液驱微观驱油实验研究

发布时间：2018-11-23 14:09

【摘要】：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~(-4)mN/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。
[Abstract]:In order to improve the recovery of the residual oil, the in-situ microemulsion flooding of the surfactant (B-1) and the monoaryl-sulfonate surfactant (A3-2) based on the anionic-nonionic and anionic surfactant (A3-2) was carried out in order to improve the recovery of the residual oil. In this paper, the oil-flooding effect of the in-situ micro-emulsion and the surfactant/ polymer binary composite flooding is analyzed, and the high-temperature and high-pressure micro-visualization simulation system is used to study the residual oil start-up and the migration way, the displacement effect and the micro-oil-drive mechanism in the in-situ micro-emulsion flooding process. The results show that 3% A3-2 and 3% B-1 can form an ultra-low interfacial tension force (on the order of 10-(-4) mN/ m), and can form a microemulsion with the crude oil in-situ (i.e., under a small amount of driving force). The capacity-increasing parameter is greater than 20. The solution of A3-2 can form a micro-emulsion with the in-situ formation of the crude oil, and the B-1 solution can form the lower-phase microemulsion liquid with the crude oil in-situ. The oil-displacing effect of the in-situ micro-emulsion flooding is better than that of the surfactant/ polymer binary compound. The solubilization capacity of the A3-2 solution is better than that of the B-1 solution, and the effect of the residual oil is the best, and the effect of the micro-flooding oil is the best. the in-situ micro-emulsion drive mainly relies on the solubilization action of the surfactant, and the micro-emulsion is formed in situ with the crude oil in the porous medium, so that the action effect of the mixed-phase oil-displacing oil is achieved; when the crude oil is solubilized in the micelle of the microemulsion to reach the saturation, the micro-emulsion is further emulsified and carried, the mechanism of reducing the interfacial tension and improving the wettability of the oil-water interface is reduced, and the cluster-like and spot-shaped residual oil is preferentially started, so that various types of residual oil can be effectively started and transported.
【作者单位】：河南油田分公司勘探开发研究院;河南油田分公司第二采油厂;长江大学地球科学学院;
【基金】：中国石油化工股份有限公司科技开发项目“高温油藏原位微乳液驱表面活性剂研究”(项目编号215088)
【分类号】：TE357.46

【参考文献】