凝析气藏反凝析规律与生产制度关系优化研究

Optimizing the Relationship between Condensate Properties and Production Regulations of Condensate Gas Reservoir

大多数以衰竭方式开采的凝析气藏在地层压力降到露点以下时,在储层中会产生反凝析,并不断堆积,造成气相渗透率急剧下降,产量大幅度递减,甚至导致井筒大量积液。针对这一生产现象,分析了不同开采阶段气藏露点压力和油气相渗透率的变化规律与特征,指出,优化凝析气井生产制度必须有效地监测凝析气井积液和地层压力,采用节点分析方法确定合理的生产制度参数。

For most condensate gas reservoirs recovered by means of exhaustion, when its pressure drops beneath the dew point, retrograde condensation is prone to arise and pile up continuously so that the gas-phase permeability descends rapidly and gas production decreases greatly, even a great deal of liquids accumulate in wellbore. In order to tackle such problem, this paper analyzes the changes and features of oil-gas phase permeability and of dew point pressure at different recovery stages. In addition, this article proposes that it is necessary for optimizing production regulations of condensate gas wells to monitor effectively the liquid accumulation in such wells and the formation pressure, also node analysis should be employed to settle reasonable production parameters.