Abstract: Well head pressure of high productivity gas wells performs abnormally while testing, that is the flowing pressure “bouncing descendascenddescend”, the buildup pressure “bouncing ascenddescend”, which differs completely from the change law of bottom hole pressure. Analysis result of high productivity gas wells in Luojiazhai shows temperature effect of well bore as the key factor affecting well head pressure. The reason for abnormal well head pressure is analyzed, nonlinear profile of well temperature is calculated through Hasan & Kabir unstable well bore temperature model, the calculation of well bore fluid pressure is modified and also, forecasting method of nonlinear temperature profile is merged into testing simulator with well bore and reservoir coupling mechanism, and abnormal phenomenon of well head pressure is simulated completely. By simulating, the test points in high productivity gas well is found “abnormal”in quite large range of depth, which is helpful for recognizing to using temperature data to modify pressure, and the key is to recover the normal condition in improving explanation and analysis technique.

Key words: well test, well bore, temperature field, transient, test simulation, Luojiazhai