基于广义拟压力法的深层火山岩产水气井产能方程

The productivity equation for water-producing gas well in deep volcanic gas reservoir based on generalized pseudo-pressure

基于气水同产两相渗流规律,考虑深层火山岩储层敏感性效应的影响,通过建立新广义拟压力函数,定量描述压敏储层条件下气水两相渗流过程.采用数值积分,计算任意压力下对应的拟压力值,确定深层火山岩气藏产水气井的流入动态方程,并结合实例分析储层渗透率压力敏感程度和水气比对气藏产能的影响.应用结果表明,用该广义拟压力方法确定深层火山岩气藏产能模型可靠.

Based on the gas-water two-phase seepge law,considering the sensitivity effect of deep volcanic reservoir,through the establishment of a new generalized pseudo-pressure function,we have quantitatively described the course of gas-water two-phase seepge under the condition of pressure-sensitive reservoir.And by using numerical integration,we have calculated the corresponding pseudo-pressure value under any stress to determine inflow dynamic equations of water-producing gas well in deep volcanic gas reservoir.We have also analyzed that pressure-sensitivity and water gas ratio have impact on gas reservoir productivity.The application result shows that the generalized pseudo-pressure method is reliable and reasonable when used to determine the productivity model of deep volcanic gas reservoir.