Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer

A transient fully coupled model is proposed to investigate the two-phase flow of CO2 and water-based fluid in a wellbore, considering complex mass heat transfer different patterns dynamic coupling between wellbore reservoir. Based on conservation, momentum, energy balance, employs state-of-the-art equation state transport models analyze variations multiphase behaviors properties wellbore. Applied scenario drilled gas kick, used simulate processes migration The results indicate that solubility increases gradually with increment depth, trend which shows an abrupt change 500-1000 m due phase transition CO2. During kick development, fronts free dissolved increase almost linearly time. Through comparison CH4 kicks, dissolution found significantly suppress development process kick. error prediction can reach 42% if effect neglected. However, it be neglected for