低渗透油藏微乳液驱微观剩余油驱替机理研究

发布时间：2018-05-28 10:19

本文选题：低渗透油藏 + 微乳液驱　；参考：《特种油气藏》2017年05期

【摘要】：为探究低渗透油藏微乳液驱微观剩余油的驱替机理,以大庆油田低渗透岩心为研究对象,通过微乳液驱油和岩心微观解剖实验,验证了微乳液驱提高原油采收率的效果,并对微乳液驱后的剩余油分布规律进行了研究。利用显微镜观察光刻玻璃模型中的驱油过程,重点研究了微乳液驱过程中残余油的启动和运移机理。结果显示:界面张力低的微乳液驱油效果好,与水驱相比,采收率提高26.38个百分点;对于同一半径的孔隙而言,界面张力越低,含剩余油孔隙比例越小。研究表明,降低残余油的启动难度,并将原油乳化成小液滴,是微乳液驱替残余油最主要的机理。该项研究证明了低渗透油藏微乳液驱油的可行性,从微观上对微乳液的驱油效果做出科学解释,有助于推动微乳液三次采油理论的完善。
[Abstract]:In order to explore the displacement mechanism of micro residual oil in microemulsion flooding in low permeability reservoirs, the effect of microemulsion flooding on improving oil recovery was verified by microemulsion flooding and core microdissection experiments, taking the low permeability core of Daqing Oilfield as the research object. The distribution of remaining oil after microemulsion flooding was studied. The oil displacement process in photolithographic glass model was observed by microscope, and the start-up and migration mechanism of residual oil in microemulsion flooding was studied. The results show that the microemulsion with low interfacial tension has good oil displacement effect, and the oil recovery is increased by 26.38 percentage points compared with the water flooding, and the lower the interfacial tension is, the smaller the remaining oil porosity is for the same radius pores. The results show that reducing the starting difficulty of residual oil and emulsifying crude oil into small droplets is the main mechanism of microemulsion displacement of residual oil. This study proves the feasibility of microemulsion flooding in low permeability reservoirs, and scientifically explains the oil displacement effect of microemulsion from the microscopic point of view, which is helpful to improve the tertiary oil recovery theory of microemulsion.
【作者单位】：东北石油大学;
【基金】：国家自然科学基金“低渗透油藏表面活性剂驱微乳液渗流机理及数值模拟研究”(51474071)
【分类号】：TE357.46

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