Abstract: Aiming at the problem that gas migration is prone to occur in low-pressure and low-permeability formations in deep drilling, the control mechanism and application effect of gas stagnation plug technology on gas upward migration behavior are discussed. Based on ANSYS Fluent software, a three-dimensional VOF (volume of fluid) multiphase flow model of the wellbore was established to simulate the upward movement process of gas in the gas stagnation plug and conventional drilling fluid. The sensitivity analysis of the maximum upward movement velocity of gas was carried out, and the application scheme of the gas stagnation plug was designed in combination with the field data. Research shows that gas stagnation plugs can significantly reduce the upward movement velocity of gas. When the viscosity is above 90 mPa·s, the deceleration effect tends to stabilize, and the maximum upward movement velocity decreases by more than 50% compared with conventional drilling fluids. The gas stagnation plug fluid system can effectively delay the time of gas channeling and enhance the well control safety of deep wells in complex strata. The research results have guiding significance for the optimization and promotion of on-site gas channeling prevention measures.