致密气田集输管道涡流工具优化设计研究

Research on Optimal Design of Eddy Current Tool for Gathering and Transportation Pipelines in Tight Gas Fields

摘要: 对于湿气集输管道，由于气流中携带的游离水、饱和水及重烃组分凝析在管道内，再加上管道沿线地形起伏、产量低，气、液流速不同，气体携液能力弱，在上坡段出现滑脱损失，继而在低洼处形成积液，管道积液和段塞流会严重影响管道输气效率，增大管道压降及井口回压，严重时将导致气井停产。通过利用FLUENT软件对地面涡流工具进行模拟，针对中心体直径、螺旋翼形状、螺旋翼旋转方向和螺旋片圈数等结构参数对涡流工具进行优化设计。最后根据模拟结果综合考虑，螺旋圈数为3圈、螺旋翼高15 mm、厚5 mm，旋流中心体直径219 mm的涡流工具能够适用于地面湿气集输管道。

Abstract: For the moisture collection pipeline, due to the free water, saturated water and heavy hydrocarbon components carried in the gas flow condensed in the pipeline, coupled with the undulating terrain along the pipeline, low yield, different gas and liquid flow rates, weak gas carrying capacity, slippage loss occurs in the uphill section, and then fluid accumulation is formed in low-lying places, pipeline liquid accumulation and segment plug flow will seriously affect the efficiency of pipeline gas transmission, increase pipeline pressure drop and wellhead back pressure, and in severe cases, it will lead to gas well shutdown. By simulating the ground vortex tool using FLUENT software, the vortex tool is optimized for structural parameters such as center body diameter, helix wing shape, spiral wing rotation direction and spiral blade turn. Finally, according to the simulation results, the vortex tool with 3 spiral turns, 15 mm high and 5 mm thickness of the spiral wing, and 219 mm diameter of the swirl center body can be applied to the ground moisture collection pipeline.