Study on the Coupling Field of Temperature and Pressure in Deepwater Drilling under Gas Kick Condition

During deepwater drilling, gas kick have a significant impact on the temperature and pressure distribution inside the wellbore, which will poses challenges to wellbore stability, fluid circulation, and operational safety. In this paper, focusing on the problem of gas invasion during deep water drilling, considering the heat transfer between the fluid in the wellbore, the formation, and the seawater, the calculation model for the temperature and pressure coupling field in deep water drilling wellbore under gas kick has been established. The influence of gas-liquid two-phase flow on wellbore temperature and pressure fields under gas kick has been analyzed. Furthermore, the influence of factors such as circulation time of drilling fluid, gas kick amount, formation depth, seawater depth, and casing size on wellbore temperature and pressure fields. The results show that the water depth is the main factor on the temperature of the deepwater wellbore annulus. The displacement of drilling fluid and the formation depth are secondary factors. The gas kick amount and drilling fluid circulation time have little influence on the temperature of the deepwater wellbore annulus. With the increase of the drilling fluid circulation time, gas kick amount and the displacement of drilling fluid, the temperature and pressure both decreases. With the increase of the formation depth, the temperature and pressure both increases. With the increase of the water depth, the temperature decreases and the pressure increases. This paper provides valuable guidance for deepwater drilling operations.