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CO2驱油是提高低渗透率油藏采收率(CO2-EOR)的有效途径之一,同时也能封存部分CO2缓解造温室效应。CO2油溶液的密度影响CO2在储层中的扩散和运移,因此对于EOR技术和CO2地质封存来讲十分重要。文章论述了在实验研究中模拟油的选取标准,目前使用的模拟油从密度和黏度考虑,主要为烃类物质及其混合物,这对于模拟低渗透油藏的原油性质具有指导意义。在此基础上对CO2-模拟油系统的密度实验测量方法进行了总结,并阐述了国内外CO2-模拟油系统密度的实验和理论研究进展。现有的研究范围和溶剂选取并不能很好地满足实际需求,这也要求系统的研究模拟油的选取标准,并对CO2-模拟油系统密度进行更接近工程实际的研究。
CO2 flooding is one of the effective ways to improve the recovery of low permeability reservoirs (CO2-EOR), and it also can seal some CO2 to mitigate the greenhouse effect. The density of CO2 oil solution affects the diffusion and migration of CO2 in the reservoir and is therefore important for EOR technology and CO2 geological storage. In this paper, the selection criteria for simulating oil in experimental studies are discussed. The currently used simulative oils are mainly hydrocarbon and their mixtures, which are instructive for simulating the properties of crude oil in low-permeability reservoirs. Based on this, the experimental methods for density measurement of CO2-simulated oil system are summarized, and the experimental and theoretical research progress of CO2-simulated oil system density at home and abroad is expounded. The existing research scope and solvent selection do not meet the actual needs, which also requires systematic research to simulate oil selection criteria and carry out closer engineering researches on CO2-simulated oil system densities.