气井积液是苏里格区块大斜井开采中后期面临的一个重要难题，目前适用于定向井的临界携液模型研究较少，且常用携液模型忽略了管径、液体流速和角度的影响。借助多相管流实验开展了定向井携液机理实验，分析了管径、角度、液体流速等因素对气井积液的影响规律，并根据液膜反转机理，在BELFROID模型和WALLIS模型基础上，利用实验数据拟合出了WALLIS模型中参数C和m的计算方法，并考虑管径、气体密度、液体密度、角度、液体表观流速、重力加速度等参数，建立了新的临界携液模型，新模型在预测VEEKEN文献中62口积液气井时结果显示，准确率为91.94%，新模型的建立不仅是液膜反转理论的进一步完善，同时也为定向井积液时机的预测提供理论支撑。

Liquid loading in gas wells is an important challenge during the middle and later stages of exploitation of large inclined wells in Sulige Block. Current critical liquid carrying models suitable for directional wells are limited and often overlook the effects of tubing diameter, liquid flow velocity, and angle. Utilizing multiphase pipe flow experiments, the liquid carrying mechanism in directional wells was studied, analyzing the effects of tubing diameter, angle, and liquid flow velocity on liquid accumulation in gas wells. Based on the liquid film reversal mechanism, the calculation method of parameters C and m in the WALLIS model was derived using experimental data on the basis of the BELFROID model and WALLIS model. A new critical liquid-carrying model has been established by considering the factors such as pipe diameter, gas density, liquid density, angle, apparent liquid flow rate, and gravitational acceleration. The results of the new model for predicting 62 gas wells with liquid loading in VEEKEN’s literature show an accuracy of 91.94%. The establishment of this new model not only further refines the theory of liquid film reversal but also provides theoretical support for predicting liquid loading events in directional wells, offering a valuable tool for optimizing gas production and mitigating liquid loading issues.