天然气管道积液临界气速预测模型研究进展

Research progress of critical gas velocity prediction model for liquid accumulation in natural gas pipeline

管道积液是气田开发过程中的常见现象,会对天然气集输系统的正常运行产生极大影响。积液预测有助于及时采取措施,减少积液带来的危害,而临界气速的计算是管道积液预测的关键。对管道临界气体流速预测相关研究进行了回顾,指出了最小压降模型、液滴模型的局限性,而液膜模型具有较好的适用性。结合管道积液实际情况,提出将现有管道积液研究成果应用于生产实际需要选择适用于不同情况的管道积液准则;合理表征不同倾角下管道内液膜周向分布;考虑复杂地形条件下大尺寸湿气管道气液流动特性;采用合理的界面摩擦因数计算式。

The normal operation of natural gas gathering and transportation system is strongly affected by the liquid accumulation in pipelines,a common phenomenon in gas field development.Available prediction of liquid accumulation is helpful to take timely measures to reduce the harm caused thereby,and the calculation of critical gas velocity is crucial to the prediction of liquid accumulation in pipelines.The related research on prediction of critical gas velocity in pipeline was reviewed,and the limitations of minimum pressure drop model and droplet model were pointed out,with the liquid film model being provided with better applicability.Depending on the actual situation of pipeline liquid accumulation,the keys to apply the existing research achievements of pipeline liquid accumulation to production practice are as follows:selecting the pipeline liquid accumulation criteria suitable for different situations,reasonably characterizing the circumferential distribution of liquid film in pipelines at different slope angles,taking into consideration of the gas-liquid flow characteristics of large-size wet gas pipelines under complex terrain conditions,and adopting reasonable interface friction coefficient calculation formula.