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 crit

ical 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.