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对于径向流直线段没有出现的情形,半对数分析方法将无法使用,图版拟合法存在着拟合结果多解的危险,并且图版拟合的结果没有半对数分析法精度高。此文通过对双对数图中的拟压力和拟压力导数曲线进行分析,从中找出一些特征点和特征线,推出了计算储层参数(K,S,C)的新公式。通过实例,将本文的方法所得到的结果与试井软件解释的结果进行分析对比,表明此文的方法对未出现径向流的气井试井解释是适用的。
Semi-logarithmic analysis method can not be used in the case of radial flow without straight line segment. There is danger of multi-solution of fitting results in plate fitting method, and semi-logarithm analysis method does not have the high accuracy of plot fitting result. In this paper, by analyzing the pseudo-pressure and pseudo-pressure derivative curves in the logarithmic graph, some characteristic points and characteristic lines are found, and a new formula for calculating reservoir parameters (K, S, C) is introduced. An example is given to compare the results obtained by this method with that of the well testing software. The results show that the method in this paper is suitable for well test interpretation of gas wells without radial flow.