在高压气井完全喷空的极端情况下，常采用置换压井的方式逐步恢复井筒内的压力平衡关系。但受液泛效应的影响，部分压井液会在高速气流的剪切作用下被携带至井口，进而造成井筒内的压力平衡速度较慢。针对上述工程问题，通过对逆向接触状态下的井筒气-液两相流动型态进行分析，构建了考虑有压井液性质与井筒空间结构影响的置换压井参数综合表达模型，并通过物理实验对模型的可靠性进行了验证。其次，针对敏感因素的多样性，利用所构建的模型依次对不同压井液密度、压井液黏度、套管内径与井斜角下的置换压井过程进行了模拟分析。研究结果表明：压井液的黏度越大，高速气流对其所产生的剪切作用越强，越易在置换压井的过程中引发液泛效应；压井液的密度越大，高速气流对其所产生的携带作用越弱，在置换压井过程中引发液泛效应的下限越高；套管内径越大，气体在井筒中的流动速度越小，其对压井液所产生的剪切作用越弱；井斜角越大，压井液所形成的液膜越厚，其与高速气流所形成的接触面积越大，越易在置换压井过程中引发液泛效应。

In the extreme case of a high-pressure gas well being completely evacuated, the method of displacement well killing is often used to gradually restore the pressure balance within the wellbore. However, due to the effect of liquid flooding, some of the well killing fluid can be carried to the wellhead by the shearing action of high-speed gas flows, resulting in a slower rate of pressure balance within the wellbore. In response to the aforementioned engineering challenges, an integrated expression model for displacement well killing parameters was built by analyzing the gas-liquid two-phase flow patterns in the wellbore under inverse contact conditions, and the reliability of the model's simulation results was verified through physical experiments. Subsequently, considering the diversity of sensitive factors, the constructed model was used to simulate and analyze the displacement well killing process under various conditions, including different densities, viscosities of well killing fluid, casing inner diameters, and well inclination angles. The results show these as follows. The higher the viscosity of the well killing fluid, the stronger the shearing action exerted by high-speed gas flows, which more readily triggers the liquid flooding effect during the displacement well killing process. The greater the density of the well killing fluid, the weaker the carrying action by high-speed gas flows, and the higher the threshold for triggering the liquid flooding effect during the displacement well killing process. The larger the casing inner diameter, the lower the flow velocity of the gas in the wellbore, and the weaker the shearing action on the well killing fluid. The greater the well inclination angle, the thicker the liquid film formed by the well killing fluid, and the larger the contact area with high-speed gas flows, which more readily triggers the liquid flooding effect during the displacement well killing process.