Abstract: By influences of internal and external factors in the reservoir, different deviations of production and pressure data from stable well testing in gas well tend to resulting in abnormal shape of productivity curve, which is difficult to get open-flow capacity. In some cases, retesting has to be needed. The major factors for them include reservoir pollution, variable skin factor, interlayer interference and sand face flux, etc. And different factors have different effects on well test data in feature and extent. For this reason, SWT2000, a well-testing software, is applied for analysis of the abnormal phenomenon in well test data, and suitable correction model is selected for effective elimination of the falsification phenomenon of the curves, followed by obtaining the productivity parameters of the gas well. Practice shows that the reliable pro-ductivity parameters can be obtained if we make correct adjustment of abnormal factors of well test data, as well as selection of proper correction model.

Key words: gas well, stable well testing, interpretation, correction, application