| At present,liquid-loading has become a common problem in gas reservoir.How to prevent liquid-loading in gas wells,or to take measures to restore its production is a significant matter for gas reservoirs.Most of the liquid-carrying models were based on the force analysis of droplets in vertical wells,and the models did not consider the influence of factors such as well angle on the liquid-carrying condition.Starting from the mechanism of liquid loading,studies the two-phase flow pattern and the calculation methods of wellbore two-phase flow,and analyzes the influencing factors of liquid loading problem.Aiming at the problem of liquid loading,a visual physical simulation experiment device for liquid loading prediction in gas well is constructed.The device is mainly composed of gas-liquid mixing device,water and gas injection system,pipeline and monitoring system.The experimental scheme was developed for different well angles,pipe diameters,liquid volume,oil-water ratio and other factors.The device is used to visualize the experimental research on the influencing factors of liquid loading.During the experiment,the flow pattern is observed,and the parameters of the two-phase flow are recorded.Based on the theory of minimum pressure drop,the experimental results were processed to analyze the influence of various factors on critical liquid-carrying velocity(critical flow).By comparing the advantages and disadvantages of the droplet model and the liquid film model,it is determined that the liquid film model is used to predict the critical liquid-carrying velocity(critical flow).The critical liquid-carrying velocity(critical flow)model is compared with the experiment results,and the model is revised with a correction factor of 0.45.The field data verification shows that the modified critical liquid-carrying velocity(critical flow)model is more accurate. |
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