Study On Downhole Throttling Characteristics Of High Water-Cut Gas Wells

For the production data of high water-cut gas wells,it is necessary to consider the water content,insufficient liquid carrying capacity,which affects the production of the gas well,and the problem of hydrate blocking the wellbore.Use downhole throttling technology to carry out research.Combining with statistical thermodynamics method and considering the water content of gas wells,a prediction model of gas hydrate formation in gas wells with high water content is established to study the relationship between different molar water content and the temperature and pressure of hydrate formation.Based on the wellbore gas-liquid two-phase pipe flow theory and heat transfer theory,a high water-cut gas well temperature and pressure coupling prediction model is established to study the influence of different working condition parameters on the wellbore temperature and pressure field;combined with downhole throttling mechanism and gas-liquid two-phase homogeneous flow Theory,establish a wellbore temperature and pressure field distribution model for high water cut gas wells under throttling conditions;consider the wellbore flow characteristics of high water cut gas wells,analyze the critical liquid carrying mechanism of gas wells,establish a critical liquid carrying flow calculation model for high water cut gas wells,and study under throttling conditions Critical liquid-carrying characteristics of high water-cut gas wells.The results show that the natural gas hydrate generation prediction model for high water-cut gas wells has higher prediction accuracy.When the molar water content is 10%,20%,50%,and 80%,the corresponding hydrate generation temperature rises and the pressure drops;high water cut Compared with the Hassan&Kabir model and Ramey model,the gas well temperature and pressure calculation model has a minimum coefficient of variation of0.022.Comparing the downhole throttle pressure and temperature calculation model for high water-cut gas wells and the Perkins model,Sachdeva model,and Ashford model to the calculation of the throttle parameters,we get a large value of 4-5 gas well has a minimum choke entry depth of 1800 m and a choke nozzle diameter of 4mm.Comparing the critical liquid carrying flow calculation model for high water cut gas wells with Tuner model and Li Min model,the model has stronger field applicability.Through the study of downhole choke characteristics of high water-cut gas wells,theprediction accuracy of wellbore temperature and pressure data has been improved,the critical liquid-carrying capacity of high-water-cut gas wells has been enhanced,and the formation of natural gas hydrates has been effectively avoided.It can provide theoretical guidance for the determination of downhole throttling process parameters for high water-cut gas wells.By studying the downhole throttling characteristics of high water cut gas wells,the formation of natural gas hydrate is effectively avoided,the prediction accuracy of wellbore temperature and pressure data is improved,and the critical liquid carrying capacity of high water cut gas wells is enhanced.It can provide theoretical guidance for the production and development of high water cut gas wells.