气井多液滴携液模型实验研究

Experimental study on multi-droplet liquid carrying model for gas well

在Zhou的多液滴模型基础上,通过可视化实验装置,采用压缩空气和水作为介质模拟气井气流携液过程,验证分析了Zhou的多液滴模型。通过大量实验数据分析发现:气体达到携液临界流速、持液率大于0.008 5时,气井开始出现积液,比Zhou所提出的0.010 0有所偏小;在持液率大于0.008 5时,加大气流速度到某值时,液体可以全部被携带出井口,且随着持液率的提高,所需的临界流速也随之增加。该文根据实验数据修正了Zhou的多液滴模型,提出了与实验数据相吻合的新模型,可用于高含水气井排水采气研究与工程实际应用。

Referring to Zhou′s multi-droplet model,this paper uses compressed air and water as a medium to simulate the carrying liquid process of gas wells with the help of visualization experimental device.Zhou′s multi-droplet model is analyzed and verified.Through analyzing a large number of experimental data,it is found that at the critical liquid carrying rate of gas,gas wells appear effusion when the liquid holdup is more than 0.008,5,which is smaller than Zhou′ s 0.010,0.As the liquid holdup is more than0.008,5,the flow velocity is increased.When the air velocity is increased to a certain value,the liquid may all be carried out of the wellhead.The necessary critical flow velocity also increases with the improvement of liquid holdup.In this paper,based on the experimental data,Zhou′s multi-droplet model is modified and the new model consistent with the experimental data is proposed.This new model can be used for the practical engineering research of water draining and gas recovering for high water cut gas wells.