关键词: 凝析气, 反蒸发, 长岩心, 实验

Abstract: To address this issue,a series of experiments in this paper are performed and compared to quantitatively investigate the revaporization 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 the simple synthetic fluid and the packed core systems used in the previous literature,the actual gas condensate fluid and 1 m long-core are employed here.An interesting finding is that lean gas can effectively revaporize not only the intermediate 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.

Key words: condensate, retrograde vaporization, long-core, experiment