The Study Of Calculation Method And Influence Factors Of Annulu Pressure Buildup In Deepwater

In the early days of the deepwater oil and gas field testing process and production,due to the large temperature difference between the trapped fluid and formation fluid,it will lead to the heat expansion and additional buildup pressure in the annulus,seriously will collapse or bursting tube,so it is very important to control the annulus pressure.we study the three aspects for predicting the pressure of the multi annulus,the prediction of the temperature of the trap,the influencing factors and the pressure release technology of the annulus trap.Based on the analysis of the existing research results and the actual situation,according to the state equation to calculate the pressure model of comprehensive research on wellbore temperature prediction,mainly considering the changes of fluid properties,studied the factors of casing deformation and temperature variation.In this paper,the pressure model of the Deepwater annular trapped pressure is verified.The results show that the new model is more accurate and the relative error is about 8%.According to the calculation,influencing factors of the annulus pressure,accurate analysis of production time,production yield,well depth,influence the length of annulus pressure traps,and release technology for deepwater trapped pressure are analyzed in this paper.