A Study Of Prediction Methods For Liquid Loading In Offshore Condensate Gas Wells

The liquid-loading in gas well is always a problem in producing.How to accurately predict the conditions of liquid-loading will help to adjust the production mode of gas wells in time.It has the advantages of low cost and predictable to judge the liquid-loading by calculating the critical gas flow rate.At present,there are many kinds of prediction models,they are mainly divided into two classification: droplet models and film models.However,due to different assumptions of these models,the prediction accuracy of the same model in different conditions is also different.This paper is based on the previous knowledge.The author had established an ellipsoid droplet model with the ratio of longitudinal axis to transverse axis of 0.753 and a liquid film models for vertical and directional wells.By analyzing the influences of the parameters of fluid properties,inclination degree,pipe diameter and liquid holdup on the models,the author found that the liquid holdup is the dominant weight of the control mechanism of liquid-loading.So the author had established a comprehensive model with the droplet model and the film model by using liquid holdup as the weight.The author found that the comprehensive model had universality and accuracy by the combination of Turner's and Coleman's gas wells.This paper used the data of 16 condensate gas wells in a gas field in a sea area of China as research objects,selected a suitable gas-liquid phase pressure drop model for the field.On the basis of having calculated the pressure distribution,the author had used different prediction models to calculate the critical gas flow rate distribution in every well.The reliability of comprehensive model was verified again by the comparison of these methods.