水平气井井身结构独特，油管不同下深会显著影响其泡沫排液采气措施效果。利用自主研制的水平气井气水流动实验装置，针对油管下深位置对水平气井气水流动规律及泡排效果开展了排液稳定性、携液气体流量大小、井段压力变化等特定研究。分析发现，不同油管下深会影响井筒中不同位置处的携液气体流量；当油管位于直井段及造斜位置时，能够促进实际积液水平气井实施泡排；油管深入至水平段跟端时，一定条件下存在环空辅助排液情况；油管下深超过水平段跟端时，泡排工艺并不适用。研究结果可为现场积液水平气井针对不同井段合理选用泡排技术的高效应用给予一定指导。 The wellbore structure of horizontal gas wells is unique, and different depths of tubing will significantly affect the effect of foam drainage and gas recovery measures. Based on the self-developed experimental device for gas-water flow in horizontal gas wells, the stability of liquid discharge, the flow rate of liquid-carrying gas and the change of well section pressure are studied for the gas-water flow law and foam drainage effect of horizontal gas wells at the lower depth of the tubing. It’s found that the down depth of different tubing affects the liquid carrying gas flow at different locations in the wellbore; When the tubing is located in the vertical section and the position of the deflection, it can promote the actual liquid accumulation horizontal gas well to implement bubbling; The oil pipe goes deep to the heel end of the horizontal section, and under certain conditions, there will be annulus auxiliary drainage; Once the lower depth of the tubing exceeds the heel end of the horizontal section, the soaking process will not be applicable. The results of study can give some guidance for the efficient application of rational selection of bubble drainage technology for different well sections in field horizontal gas wells with liquid accumulation.