凝析油地下反蒸发的实验研究

针对一富凝析气藏,在有介质和无介质、保持压力和部分保持压力条件下进行了一系列注气实验。实验结果表明,注入气体与原始凝析气藏流体进行组分交换使凝析现象明显,注入干气不仅能在地下反蒸发凝析油中的中间烃类,而且也能有效蒸发C₂₀+以上的重烃。作者首次采用实际凝析气藏流体和岩心进行长岩心注气实验,研究凝析油地下反蒸发的情况,对富含凝析油气田开发方式的优选,具有实际的指导意义。

EXPERIMENTAL INVESTIGATION OF RETROGRADE VAPORIZATION OF OIL CONDENSATE AT SUBSURFACE CONDITIONS

To address this issue,a series of experiments in this paper are performed and compared to quantitatively investigate the revaporizati on efficiency of retrograde condensate by lean gas injection.The studies include three main parts:(1) gas injection below the dew point in the PVT cell; (2) gas injection above and (3) below the dew point in long core equipment.Instead of t he simple synthetic fluid and the packed core systems used in the previous liter ature,the actual gas condensate fluid and 1 m long-core are employed here.An in teresting finding is that lean gas can effectively revaporize not only the inter mediate but also heavy hydrocarbon( i.e.,C_20~ ),which is contrary to the common belief that the heavy hydrocarbon cannot be revaporized by lean gas.