Establishment of Wellbore Temperature Field During High Temperature and High Pressure Well Cementing in Western South China Sea

Abstract

The western part of south China sea is characterized by high geothermal gradient, abnormal overpressure development and narrow formation pressure window in the deep part of the basin. In the process of cementing, the annulus has high pressure consumption, high risk of leakage, and significant influence of temperature on the rheology and hydration of cement slurry. In order to accurately determine the rheological and rheological parameters of cement slurry and prevent possible well leakage, overflow and even blowout accidents in the process of cementing, it is necessary to establish a wellbore temperature field model in the process of cementing. Based on the data of the actual drilling well, the variation of wellbore temperature under different pump displacement and circulation time is analyzed. The results show that the annular temperature is larger than the annular temperature at the beginning, and the annular temperature is larger than the annular temperature with the increase of depth. With the increase of displacement, the bottom hole temperature decreases and the outlet temperature increases. With the extension of the cycle time, the bottom hole temperature decreases and the outlet temperature increases. When the cycle time reaches a certain value, the bottom hole and outlet temperature remain basically unchanged.