平衡油-平衡气混合相态研究

凝析气藏衰竭开发过程中,压力低于露点压力时,会发生反凝析现象,凝析油在近井地带迅速聚 集,严重损害气井生产能力。通过混合不同比例的平衡油气流体,测定混合后的油气体积变化来研究生 产过程中近井地带平衡凝析油气渗流时反凝析液饱和廑变化。研究结果表明,平衡油相体积随加入平衡 气量的体积比例增大而减少,两相混合后体积要收缩。同时也说明当在井底附近凝析油析出后,随着流 经的近井地带平衡凝析气量的增加,对凝析油的蒸发怍用是很强的。

Research on Mixed Phase State of Balanced-oil and Balanced-gas

During the depletion production of condensate gas reservoirs, when pressure is lower than the dew point pressure, condensate phenomenon occurs, the condensate gas is accumulated rapidly in near-wellbore area and is the production capacity of gas wells severely damaged. By mixing the balanced oil-gas fluids of different ratios, the volumetric changes of the mixed oil and gas are detected to study the changes of retrograde condensate saturation when the balanced oil and gas percolation occur in the near-well-bore area in production. The result shows that the volume of balance oil decrea- ses with the proportional increase of added balanced gas volume, the volume is reduced after 2 phases are mixed together. It also shows that after the condensate gas occurs near the bottomhole, with the increase of the volume of balanced condensate gas flowing through the near-wellbore area, it has a stronger oil evaporation effect on the condensate oil.