高速非达西流动定压生产气井试井分析方法

针对定压气井试井中求取高速非达西流动因子的难题，研究了井筒周围气体高速非达西流动影响，推导得出了无限大地层气井定井底流压生产的渗流方程，通过对该方程的处理，并对定压生产气井试井数据进行分析，确定出此类气藏的储层渗透率、非达西流动因子和表皮因子。实例分析表明，对于具备条件进行定流压生产测试的气井，利用该试井分析方法可方便、准确地求取地层参数。

Well Test Analysis of Gas Well Producing at Constant Pressure Accounting for High Velocity Non-Darcy Flow

This paper presents the derivation of a flow equation, considering gas well producing at constant pressure in infinite gas reservoir with accounting for high velocity non-Darcy flow effect in vicinity of the well bore. With further treatment of this equation and analysis of gas well test data, formation permeability, non-Darcy flow factor and skin factor can be determined reliably. Examples show that as for gas well in which constant-pressure well test can be applied, the proposed well test method can acquire formation parameters conveniently and accurately.