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修正等时试井作为适合于低渗透气藏气井产能试井的方法，以其测试时间短等优点，在国内外气田得到广泛应用。针对长庆低渗气田气井修正等时试井资料分析时，不稳定产能曲线偏离第一不稳定点的现象及修正等时试井理论的不严格性，采用叠加原理，在理论分析的基础上，对修正等时试井资料的现行分析方法进行了剖析；探讨了现行分析方法的不准确性，回答了上述现象产生的原因；提出了一种改进的修正等时试井资料分析方法。改进方法不仅保持了修正等时试井的优点，而且使修正等时试井具有等时试井的功能，即精度高，测试时间短。改进分析方法的精度一般依赖于叠加分析的斜率，由此获得可靠的叠加图斜率是保证正确应用改进分析法的基础。该方法结果与模拟结果对比，数据接近，说明有应用价值。
Amending the isochronal well test, which is suitable for well test of gas wells in low permeability gas reservoirs, has been widely used in domestic and overseas gas fields because of its short testing time. Aiming at the analysis of isochronal well test data of Changqing low-permeability gas field, the phenomenon that the unstable productivity curve deviates from the first instability point and the non-strictness of amending the isochronal well test theory are used. Based on the theoretical analysis , Analyzed the current analysis methods for the correction of isochronal well test data, discussed the inaccuracy of the existing analytical methods, answered the reasons for the above phenomena and proposed an improved method for the analysis of isochronal well test data. The improved method not only maintains the advantage of modifying the isochronal well test, but also makes it possible to modify the isochronal well test with the function of isochronal well testing, ie, high precision and short test time. Improving the accuracy of analytical methods generally depends on the slope of the overlay analysis, and obtaining a reliable overlay slope is the basis for the correct application of the improved analysis method. The results of the method are compared with the simulation results, and the data are close to each other, indicating that the method has application value.