近井地带凝析油聚集机理研究综述

凝析气藏衰竭开发过程中,当压力降到露点压力以下时,凝析油会在近井地带迅速聚集,严重损害凝析气井的生产能力.从实验和理论上综述凝析油在近井地带的聚集机理,通过研究凝析气藏衰竭开发过程中出现在近井地带的凝析油气流动的不同流型和相态特征,评价近井地带可动凝析油和不可动凝析油对气体流动性的影响.准确认识凝析油气的聚集特征和聚集机理对凝析气藏的高效开发具有重要的指导意义. 

DEVELOPMENT ON CONDENSATE BANKING MECHANISM NEAR THE WELLBORE IN GAS-CONDENSATE RESERVOIR

During the depleted exploitation of a gas condensate reservoir, the condensate can build up rapidly around a production well when the bottom-hole flowing pressure falls below the dewpoint pressure in the gas condensate field. This bank grows as the reservoir pressure declines, thus impairing the well deliverability of gas well. This paper sums up the condensate banking mechanism near the well-bore with respect to the experiment and theory. Based on the investigation of various flow and phase behavior in the near-wellbore region during the pressure depletion of a gas condensate reservoir, the characteristic effects of mobility and immobility condensate saturations on the mobility of a gas near the wellbore are evaluated. It is important for the highly economic and effective development of a gas condensate reservoir to understand the banking characteristics and mechanism of the condensate correctly.