垂直井筒中涡流工具流动特性数值分析

Numerical analysis of flow characteristics of vortex tools in vertical wellbore

为了更清楚地了解排水采气过程中管内流场分布情况及涡流工具中流体的运动情况,利用流体数值模拟软件,针对连续油管及涡流排水采气技术进行研究,同时对两种排水采气方式内部流场进行分析和对比,得到液相分布云图和速度图。通过对涡流工具的研究以及模拟分析可以得出以下结论:在该两相流模式中,管壁液相流动是主要的一种流动形式,涡流工具主要是依靠其结构对流体进行导向流动,流体在涡流工具的作用下产生旋转流动。在涡流排水采气过程中,含液量对轴向速度及切向速度影响相对较小,含液量主要影响过流压降。

In order to understand more about the distribution of flow field in the process of water drainage for gas pro.duction and the movement of fluid in vortex tool,fluid numerical simulation software is used to study the technology of coiled tubing and vortex drainage gas recovery.Meanwhile,the internal flow fields of the two drainage for gas production methods are analyzed and compared,the liquid phase distribution cloud map and velocity map are then obtained.Through the research and simulation analysis of the vortex tool,the conclusions are as follows:tube wall liquid flow is the main form of flow in the two-phase flow mode;the vortex tool mainly relies on its structure to guide the flow of the fluid,and the fluid generates a rotating flow under the action of the vortex tool.In the process of vortex drainage for gas produc.tion,the influence of liquid content on axial velocity and tangential velocity is relatively small,and it mainly affects the overcurrent pressure drop.