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本研究应用无汞 PVT相态实验装置测定了一个六组分烃类混合物和两个实际凝析气流体的监界点、近临界泡点和露点线 ,观察并记录了流体在近临界区的光学现象和异常的两次相变过程。在近临界区三种流体呈现红棕色 ,而不是文献所报导的二氧化碳的乳白色 ,这种区别可能是由于流体中含有较多的重质组分所致。实验发现富凝析气近监界光学现象与明确组分流体相比存在很大差异 ,即富凝析气在很宽的温度范围内均可观察到临界现象。此外 ,实验还发现六组分烃类流体和一个凝析气流体在温度高于临界温度时 ,恒质膨胀过程中发生两次反凝析露点变化 ,即露—露相变 ;在低于监界温度时也发生两次相变现象 ,即先出现露点后出现泡点 ,此时将很难区分原始流体是液体还是气体。据所掌握的资料看 ,本文是首次报道同一流体在温度高于 10 0℃时 ,同时出现两次异常相变现象
In this study, the monitoring point, the near-critical bubble point and the dew point line of a six-component hydrocarbon mixture and two actual condensate gases were measured using a mercury-free PVT phase-state experimental device. The fluid was observed and recorded in the near-critical Optical phenomena and abnormal transformation of the two phases. The three fluids in the near-critical zone are reddish brown instead of the milky white of carbon dioxide reported in the literature. This difference may be due to the presence of more heavy components in the fluid. The experimental results show that there is a great difference between the condensate near-superconductor optical phenomenon and the explicit component fluid, that is, the critical phenomenon can be observed in the rich condensate gas over a wide temperature range. In addition, the experiment also found that the six components of hydrocarbon fluid and a condensate gas fluid at a temperature above the critical temperature, the constant expansion of the process of condensate twice the dew point change, that is, dew-dew phase change; Boundary temperature occurs when the two phase changes, that is, after the emergence of bubble point dew point, it will be difficult at this time to distinguish between the original fluid is liquid or gas. According to the information available, this article is the first to report the same fluid at a temperature higher than 10 0 ℃, the same time, two abnormal phase transition