关键词: 高含蜡, 凝析气, 相态特征, 露点, 泡点, 临界点, 实验

Abstract: The phase behavior of a new type of gas condensate systems with high wax content was investigated systematically using the high pressure PVT equipment.The lab fluids are recombined using the gas and liquid samples collected from an actual gas condensate reservoir. The results showed that the single fluid appears red brown in PVT cell,as the fluid pressure was greater than its saturation pressure.The saturation pressure increased with decreasing temperature.The quality lines of the high GOR fluid were parallel to each other.Thus the fluid had no convergence point.Also cricondenbar was not found which is the maximum saturation pressure on the envelope locus.The gas phase equilibrated with the solid also had retrograde condensation,which results in three phases of gas-liquid-solid and layering in the liquid phase. The saturation pressure increasing with increase of gas-oil ratio is very important to the reservoir engineering.

Key words: high-content wax, gas condensate, phase behavior, dew point, bubble point, critical point, experiment