气井产水时产能方程的确定

随着气井生产的进行，地层中存在的可动水会不断在井底聚集，造成气井生产水气比上升，严重影响气井产量和产能，并影响整个气田的储量评估及开发方案的实施。从气井拟稳定流动状态产能方程出发，利用气、水相渗曲线与生产水气比的关系，结合等效表皮系数对不同生产水气比时的产能方程进行修正，从而获得了产水气井的产能方程。实例计算表明，修正后的产能方程更加符合生产实际。

Deliverability equation for water-production gas well

The movable water existent in the strata will assemble at the bottom of gas well in the producing process, which causes the water-gas ratio rising. It will affect the output and deliverability of gas well seriously, and affect the reserve assessment and the implementation of development program. Based on the pseudosteady state flow deliverability equation, the relationship between relative permeability curves and water-gas ratio in production and the equivalent skin coefficient are applied to modify the deliverability equation under different water-gas ratio in production, and then a new deliverability equation for gas well is obtained. The practical application shows that the modified deliverability equation is more applicable for the actual production.