气中水含量对气藏流体相态与渗流的影响

考虑地层水的蒸发对烃类气藏生产的影响的研究较少，研究认为，从地层到地面过程中，气中水蒸汽含量的变化规律有3个阶段：近井区域的气-水两相平衡阶段；井底附近的未饱和阶段；井筒中某一点到地面的非平衡的“过饱和阶段”，也就是凝析水的产生。同时考虑到由于井底附近压力的降低，地层水的再蒸发，还可能对井底附近的储层造成盐堵，从而降低其渗透率对生产造成影响。当烃类气的组分含量变大时，平衡时其饱和水蒸汽含量相对较大；考虑实际地层中水蒸汽存在时，无论从实验室还是相平衡计算的结果来看，都使凝析气的露点压力有所降低。

The Influence of Water Content in Gas on Reservoir Fluid Performance and the Flow-Through Porous Media

There is little the research on the influence of evaporation of formation water on gas reservoirs,the authors of this paper indicate the law of the change of water vapor content in gas includes three stages,i.e.water-gas two phases equilibrium stage near well area;the under saturated stage adjacent bottom hole and the non-equilibrium over saturated stage from a certain point in well bore to surface,that is,the generation of water condensate.Meanwhile,it is considered that the reservoir pressure nearby the bottom hole drops and the re-evaporation of formation water may form salt block to the reservoir rocks near the bottom hole,as to decrease the permeability and impact production.The higher the compositional content of gases hydrocarbon is,the more the saturated water vapor is while equilibrium.Considering existence of water vapor in formation water,the dew point of condensate gas,checked from the results of experimental test or phase equilibrium calculation,will drops.