伤害表皮变化时气井产能的校正

A productivity correction for gas well with changing skin factor.

如果压井液压井时间过长，或其它原因使修正等时试井前的放喷排污程度差，在产能测试中，压井液对近井地带的伤害有时会随着油嘴的放大而逐渐变小。利用伤害表皮系数变化中的井底流压求得的产能方程及无阻流量是不准确的，甚至有时二项式产能曲线是向下的，无法进行通常的产能分析。给出了２种校正方法，同时给出了２个气井产能校正的实例。图２表３参１（陈志宏摘）

In modified isochronal test, the damage sometimes decreases with the production test, so that a IPR formula derived and an open flow productivity calculated are inaccurate due to the well bore pressure and the changing skin factor, and sometimes, the binomial productivity curve is even inverse so that the traditional productivity analysis can not be made. This paper gives corrected methods and two examples for the productivity analysis.