Temperature and Pressure Coupling Field Distribution Law in Deepwater Drilling Wellbore under Gas Kick

Gas kick during deepwater drilling significantly affects the temperature and pressure distribution inside the wellbore, posing potential safety risks to deepwater drilling operations. To address the gas kick issue in deepwater drilling, the heat transfer among the fluid in the wellbore, the formation, and the seawater was considered, and the calculation model for the temperature and pressure coupling field in deepwater drilling wellbore under gas kick was established. The influence of gas-liquid two-phase flow on wellbore temperature and pressure fields under gas kick was analyzed. Additionally, the influence of factors such as drilling fluid circulation time, gas kick amount, formation depth, seawater depth, and flow rate of drilling fluid on wellbore temperature and pressure fields were explored. Results show that the seawater depth is the primary factor affecting the annular temperature of the deepwater wellbore. Drilling fluid flow rate and formation depth are secondary factors. The gas kick amount and circulation time of drilling fluid have the minimal impact. With the increase in the circulation time of drilling fluid, the gas kick amount and flow rate of drilling fluid, the wellbore temperature and pressure both decrease. With the increase in the formation depth, the wellbore temperature and pressure also rise. With the increase in the seawater depth, the wellbore temperature decreases, while the pressure increases. The results have a guiding significance for the temperature and pressure coupling field distribution in deepwater drilling wellbore and the safety of deepwater drilling operations.