There are two defects in the analysis method of the conventional modified isochronal test data, especially in the low permeability gas well with small control reserve of a single well.

• 对于单井控制储量比较低的低渗透致密储集层气井,传统修正等时试井分析方法的不足是:二项式系数偏小甚至为负,稳定点的确定没有完全按定义进行。