The problem of effusion in gas well bottom hole grows increasingly serious in the late exploitation of gas field.The technology of vortex drainage has good prospects because the tool is conveniently manufactured and environmentallyfriendly. Currently, the mechanism for the vortex drainage and the theory of fluid motion are still missing. Therefore, in orderto further realize the flow field of bottom hole, verify drainage mechanism and optimize working conditions, the studyestablished a three-dimensional structural model of vortex tools to simulate the progress of gas well drainage by using theCFD software Fluent. By monitoring the liquid content of wellhead, liquid’s radial distribution, observing the flowing stateof gas-liquid and the path line, analyzes the influence of gas production rate, liquid producing capacity of wells and themain structure parameters of vortex tools (the length of the pitch of the helical blade and screw) on gas well flow field. Thestudy revealed the working mechanism of vortex tools to facilitate the understanding of the nature of the vortex drainageprocess, guided the field how to select the preferred process conditions and provides the basis for optimizing the structureand provide theoretical basis for the application and the dynamic simulation of vortex drainage technology.
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