Abstract: Gas-liquid separation for the produced fluid of CO2 flooding is an important step in the process of carbon capture，utilization and storage（CCUS），and its efficiency directly affects subsequent crude oil dehydration，associated gas processing，produced water treatment，as well as the selection and operation life of related equipment. Based on the basic composition of the produced fluid，the impact of CO2 on the properties of associated gas，oil and produced water is stated，and the main impacting factors and mechanism of oil foaming and associated gas desorption are analyzed. And then，a solution for efficient separation of gas and liquid is put forward，main methods and application effect of gas-liquid separation are reviewed，and the direction and trend for future study on gas-liquid separation are pointed out. The results show that the relationship between the pressure reduction rate and the foaming characteristics of oil is the key scientific problem to determine the pressure and stage number for gas-liquid separation. Establishing a prediction model for the relationship between oil foam volume and defoaming time under the synergistic effect of multiple factors is helpful to determining the separation time. The organic combination of ultrasonic desorption technology and mechanical separation technology is expected to form a new cost-effective and efficient gas-liquid separation technology

Key words: CO2 flooding, produced fluid, foaming characteristics, desorption characteristics, gas-liquid separation

摘要： CO2驱采出流体气液分离是CCUS（碳捕获、利用与封存）过程中的重要环节。其效率直接影响后续原油脱水、伴生气处理和污水处理的效果以及相关设备的选型和运行寿命。根据CO2驱采出流体的基本组成，阐明CO2对伴生气、原油及采出水性质的影响，剖析原油发泡、伴生气解吸的主要影响因素及机理，提出气液高效分离的解决方案，评述气液分离的主要方法及应用效果，指明气液分离下一步研究的方向及趋势。结果表明，降压速率与原油发泡特性的关系是确定气液分离压力及分离级数的关键科学问题；建立多因素协同作用下原油泡沫体积与消泡时间关系预测模型有助于分离时间的确定；超声波解吸技术与机械分离技术的有机结合可望形成经济高效的气液分离新技术。

关键词: CO2驱, 采出流体, 发泡特性, 解吸特性, 气液分离