特种油气藏2017，Vol.24Issue(5)：136-140,5.DOI:10.3969/j.issn.1006-6535.2017.05.025
低渗透油藏微乳液驱微观剩余油 驱替机理研究
Study on Microemulsion Flooding Mechanism for the Residual Oil in Low-permeability Reservoirs
摘要
Abstract
For exploring the microemulsion flooding mechanism for the residual oil in low-permeability reservoirs, taking the low-permeability cores of the Daqing Oilfield as the study targets,by experiments of microemulsion oil flooding and micro core dissection,we verified the effect of enhanced oil recovery by microemulsion flooding,and studied the residual oil distribution law after microemulsion flooding. By applying microscope to observe the oil flooding process in photoetching glass model,we mainly studied the startup and migration mechanism of the residual oil during microemulsion flooding process. The study result shows that:(1)the microemulsion with lower interfacial tension has better oil flooding effect;(2)compared with water flooding,the recovery ratio is increased with 26. 38 percent points;(3)for the pores with the same radius,lower interfacial tension means smaller pore ratio with re-sidual oil. This study indicates that to reduce the startup difficulty of the residual oil and to emulsify crude oil to be small droplets are the major mechanism for flooding residual oil by microemulsion. This study proves the feasibility of microemulsion oil flooding in the low-permeability reservoirs,provides scientific interpretation of the microemul-sion oil flooding effect in microcosmic view,and is helpful for improving the theory of tertiary oil recovery by micro-emulsion flooding.关键词
低渗透油藏/微乳液驱/界面张力/驱油效果/微观剩余油/驱替机理/大庆油田Key words
low-permeability reservoir/microemulsion flooding/interfacial tension/oil flooding effect/microcos-mic residual oil/displacement mechanism/Daqing Oilfield分类
能源科技引用本文复制引用
殷代印,项俊辉,房雨佳..低渗透油藏微乳液驱微观剩余油 驱替机理研究[J].特种油气藏,2017,24(5):136-140,5.基金项目
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) （51474071）
