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根据气井指数方程和物质平衡方程，在定压生产方式下，推导出了气井无因次产量与无因次时间关系式。根据该式绘制出不同渗流指数的若干张理论图版，应用这些图版，可确定气井的动态储量并建立气井动态预测模型。文中还用实例给出了在定产方式下气井稳产期，稳产期采出程度以及稳产期末地层压力的预测方法。

^DECLINE LOWS AND PERFORMANCE PREDICTION OF GAS WELL PRODUCTION

The relation expression between dimensionless production and dimensionless time of gas well in the productive condition at constant pressure is derived out according to exponential equation and material balance equation. A number of theoretical charts with various percolation indexal are drawn up by the equation. The charts can be used to determine recoverable reserves and set up the predictive model of gas well Performance. The stable production period of gas well in the productive condition at constant rate, the recovery in stable production period and the method of predicting formation pressure in the end of stable Production period are given out by example.