中文摘要：

大庆天然气田目前采用涡流工具进行气井排液，但在部分井中排液效果不明显。根据气液2相流理论，应用SolidWorks软件建立涡流工具模型，应用Fluent软件进行仿真计算，分析天然气流速、井底含水率和涡流工具结构对其排液效果的影响。分析结果表明，天然气流速、含水体积分数和涡流工具螺旋片的正截面形状是影响涡流工具排液效果的主要因素。具体表现为：天然气流速越大，工具排液效果越好；井底含水体积分数小于10％时，排液效果不明显；井底含水体积分数大于10％时。含水体积分数越高，排液效果越明显；螺旋片正截面为矩形比为梯形时的排液效果更理想；螺旋片的旋转方向（左旋和右旋）对工具的排液效果影响不大。

英文摘要：

The natural gas fields in Daqing are currently adopting the vortex tool to conduct gas well drain- age. But the effect of liquid discharge is not remarkable in some of these wells. The SolidWorks software was applied to establish the vortex tool model according to the gas-liquid two-phase flow theory. The Fluent software was used to conduct a simulation calculation. The effect of natural gas flowrate, downhole water content and vortex tool structure on the drainage effect was analyzed. The analysis shows that natural gas flowrate, water content and the normal sec- tion form of vortex tool helical ribbon are the main factors to affect the drainage effect of vortex tool. The specific de- tails are that the larger the natural gas flowrate, the better the tool drainage effect. When the bottomhole water vol- ume fraction is less than 10%, the drainage effect is not obvious. When the bottomhole water volume fraction is greater than 10%, the higher the fraction, the more obvious the effect. The effect is more desirable when the normal section of helical ribbon is rectangular than when it is trapezoid. The rotation direction （levorotation and dextrorota- tion） of helical ribbon does not have remarkable effect on the drainage effect.