Abstract: A selfdeveloped high⁃pressure CO2⁃crude mixing container is used to mix up CO2 and waxy crude oil respectively under reservoir condition, and gelling and yielding properties of the waxy crude oil are studied by gas chromatograph, DSC, rheological measurement, microscopic observation and other instruments. A brief summery about the effect of CO2 pretreatment on waxy crude oil was given. After treated by CO2, the reduction of light component in the waxy crude oil can inhibit the wax dissolution and increase the wax appearance temperature of waxy crude oil. The size of wax crystals becomes smaller and disperser after treated by CO2, which gives rise to the enhancement of the gel structure and the depravation of the low⁃temperature rheological property. With the increase of the pressure of CO2 during mixing process, the gelling and yielding properties of waxy crude oil are changed more and more obviously.

Key words: Waxy crude oil, CO2, Wax precipitation, Gel structure, Yield

摘要： 利用自主研发的CO2⁃原油PVT装置,在模拟地层条件下对含蜡原油进行CO2预处理，并通过气相色谱分析、DSC热分析、流变测量、显微观察等手段研究了不同压力CO2预处理对含蜡原油的物性及胶凝特性的影响。结果表明，经CO2预处理后，含蜡原油中的轻烃含量减少，使原油对蜡晶的溶解能力降低，含蜡原油的析蜡点和析蜡量升高；CO2预处理使原油析出蜡晶尺寸更加细小，结构更加致密，导致含蜡原油胶凝结构的弹性增加，屈服值增大，低温流变性恶化；随着CO2预处理压力的增大，含蜡原油胶凝屈服特性变化越来越明显

关键词: 含蜡原油, CO2, 析蜡特性, 胶凝结构, 屈服