Experiment and analytical modeling on wellbore pressure drop in oil wells with high gas liquid ratio
Oil wells with high gas liquid ratio are very common in deep and ultra-deep oil reservoirs,which are characterized by large wellbore pressure drop and complex flow laws.Accurate prediction of wellbore flow parameters such as wellbore pressure drop,location of gas precipitation and gas content is very important for prediction of stop time of natural flow and design of artificial lift technologies.Therefore,oil-gas-water three-phase flow law simulation experiment was carried out in this paper to analyze the effect law of parameters such as gas velocity,liquid velocity,watercut and inclined angle on liquid holdup.Then,based on the experimental results,flow similarity between the low-pressure experiment and the high-pressure gas wells was analyzed.Considering the effect of pressure change on gas phrase density,the gas and liquid phrase dimensionless numbers were modified,and a new liquid holdup calculation model was established.The relative and absolute percentage errors bewteen the model and experimental results were only 0.88％and 12.50％,respectively.Additionally,a wellbore pressure drop prediction model of oil wells with high gas liquid ratio was established,which was validated by using the measured pressure drop data in 47 oil wells,and the results showed that the performance factor of the new model was the lowest among all evaluation models,being only 0.22,indicating that the accuracy of the new model is high and can meet the engineering requirements.
high gas liquid ratioflow lawswellbore pressure dropliquid holdupflow similarity
万方数据
维普
