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注水井不稳定试井问题属于油水两相渗流问题，建立了能够描述水驱过程的注水井试井解释模型。利用Ｂｕｃｋｌｅｙ－ｌｅｖｅｒｅｔｔ驱油方程可确定任意时刻的油水饱和度分布，代入差分方程可快速计算压力分布。根据关井时刻的压力和油水饱和度分布可以计算出关井后注水井的压力降。该压降涉及油水相对渗透率、注水时间、污染系数和井筒储存系数等因素。研制了一套实用的注水井压力降试井典型图版，简要介绍了根据上述理论编制的注水井压降试井分析软件的功能和特点，最后给出了应用本软件处理的实际例子。
Well test of unstable injection well belongs to oil-water two-phase seepage problem. Well test interpretation model of water injection well that can describe waterflooding process is established. The Buckley-leverett flood equation can be used to determine the oil-water saturation distribution at any time, and the difference equation can be substituted to calculate the pressure distribution rapidly. According to the pressure at the time of shut-in and the distribution of oil-water saturation, the pressure drop of the water-injection well after shut-in can be calculated. The pressure drop involves such factors as relative oil-water permeability, water injection time, pollution coefficient and wellbore storage coefficient. A set of practical graph of pressure well test well for water injection well has been developed. The function and characteristics of well test software for well pressure drop testing based on the above theory are briefly introduced. Finally, practical examples of the application of this software processing are given.