关键词: CO₂,    ,  甲烷,    ,  溶气特性,    , 流变特性

Abstract: Based on different proportions of CO2 and CH4 mixture gas source, the experiment pretreated Changqing oil by using selfmade saturated dissolved gas crude oil processing device under simulated stratum conditions, and then saturated dissolved gas crude oil was got through step by step depressurizing under gathering and transportation conditions (0~3.5 MPa). Crude oil's solubility (Rs), volume factor (Bo), condensation point (TZ), viscosity (μ) and yield value (τy) were studied by using highpressure equipment, which could measure properties of live oil, and highpressure rheometer. The results showed that Rs and Bo increased with the increase of pressure. As the temperature increased, Rs decreased and Bo increased. When experiments were conducted with the same temperature and pressure, Rs (CO2) was the double of Rs(CH4), and the Rs of mixture gas was between the two formers, and the crude oil got better expansion effect with the mixture gas. Among mixture gas, molar ratio of 9∶1 (n(CO2)/n(CH4)) had the best expansion effect, and such mixture gas had best improvement of crude oil's condensation point, viscosity and yield value.

Key words: Carbon dioxide,    ,  Methane,    ,  Solubility,   ,  Rheological properties