长江大学学报（自然科学版）2024，Vol.21Issue(5)：73-81,9.
一种新的水平气井临界携液气流速预测模型
A new prediction model for the critical gas velocity of liquid-carrying in horizontal gas wells
摘要
Abstract
The phenomenon of liquid loading in gas wells is the backflow and accumulation of fluid in the wellbore.It is one of the serious production problems in gas wells.It can lead to reduced production and even production shutdown.The ability to predict fluid accumulation in gas wells is important for ensuring positive production and optimizing related production processes.In order to take appropriate countermeasures to prevent the occurrence of fluid accumulation in a timely manner,it is crucial to accurately predict and identify the accumulation points.In this paper,indoor experiments were conducted using an air-water mixture in a 60 mm diameter pipe with 0.2 MPa and 0.5 MPa pressure at 0～90° inclination angles.The variation of the critical gas flow rate at different angles,pressures and liquid volumes was analyzed.As the angle increases,the critical gas velocity first increases and then decreases.The inclined section is the most difficult well section to carry fluid.55° inclination angle is the most difficult angle to carry fluid.Based on the analysis of fluid film forces.Considering the inhomogeneous distribution of the liquid film on the wall of the inclined gas well,SHEKHAR's equation for the maximum liquid film thickness distribution is used.Considering the balance of droplet load and liquid film entrainment in the gas core,a new critical liquid-carrying prediction model for inclined gas wells was developed.The new model is compared with LUO model,BARNEA model and LIU model using experimental data and field data.The model calculates the best agreement with the field data with an accuracy of 91％.It shows that it has better performance than other fluid accumulation prediction models.The new model can be used for the judgment of horizontal gas well liquid loading.关键词
气井/临界气体流速/积液/液膜厚度Key words
gas well/critical gas flow rate/liquid loading/liquid film thickness分类
能源科技引用本文复制引用
刘自龙,刘琳,房雨泽,廖锐全..一种新的水平气井临界携液气流速预测模型[J].长江大学学报（自然科学版）,2024,21(5):73-81,9.基金项目
国家自然科学基金项目"多种通讯约束下网络化智能系统的性能分析与优化设计"(62173049) （62173049）
非常规油气省部共建协同创新中心开放基金项目"页岩气水平井井筒两相流流型及转变界限研究"(UOG2022-25). （UOG2022-25）
