Prediction Model of Wellbore Temperature Field in Ultra-deep Shale Oil Horizontal Well During Managed Pressure Cementing

Horizontal well is the main well type of ultra-deep shale oil exploitation, and the prediction of temperature field in the horizontal well managed pressure cementing (MPC) process is of great significance to the field construction. Based on energy conservation and thermal resistance method, taking conventional three-stage well as an example, the prediction model of wellbore temperature field in ultra-deep horizontal wells of shale oil was established. The effect of well trajectory and fluid performance parameters on temperature field were considered comprehensively to improve the prediction accuracy of the model. A well in China was taken as an example to verify the model, and the model can simulate the changing law of various parameters and has good applicability. The influence factors of temperature field were analyzed. The results show that the temperature of drill pipe and annulus decreases with the increase of cycle time. The formation temperature at wellhead increases with the increase of cycle time, while the formation temperature at bottom hole decreases with the increase of cycle time. The length of horizontal section has little effect on bottom hole temperature. The inlet temperature of cementing fluid has little influence on the long horizontal section. Increasing cementing fluid density, displacement, and time can reduce bottomhole temperature. The research results provide a theoretical basis for the exploration and development of ultra-deep shale oil.