Shut-in static pressure calculation of condensate gas wells considering phase behavior change in borehole

Up to now,researchers are still using the method used for conventional gas wells to calculate the shut-in static pressure of condensate gas wells,while the calculating accuracy can not meet the demand of performance analysis and production management without considering the phase behavior in borehole. From the analysis of the shut-in phase behavior change,combining with borehole pressure change and temperature distribution change,based on gas-liquid balance calculation,pressure calculation model considering borehole phase behavior change in the process of shut-in pressure recovery is established and phase behavior change law and pressure distribution in this process are studied. This calculating result agrees well with the practical and this shows that this calculating method considering the phase behavior change in the process of shut-in pressure recovery can not only solve the problem that pressure gauge could neither be put in the middle part of layer nor operate normally but also be a substitute to shut-in pressure build up test so as to save up a great deal of manpower and material resources.