Abstract
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 environmentally friendly. Currently, the mechanism for the vortex drainage and the theory of fluid motion are still missing. Therefore, in order to further realize the flow field of bottom hole, verify drainage mechanism and optimize working conditions, the study established a three-dimensional structural model of vortex tools to simulate the progress of gas well drainage by using the CFD software Fluent. By monitoring the liquid content of wellhead, liquid’s radial distribution, observing the flowing state of gas-liquid and the path line, analyzes the influence of gas production rate, liquid producing capacity of wells and the main structure parameters of vortex tools (the length of the pitch of the helical blade and screw) on gas well flow field. The study revealed the working mechanism of vortex tools to facilitate the understanding of the nature of the vortex drainage process, guided the field how to select the preferred process conditions and provides the basis for optimizing the structure and provide theoretical basis for the application and the dynamic simulation of vortex drainage technology.
Highlights
With the rapid development of the natural gas industry, one of the main problems in natural gas deep exploitation is the liquid loading of gas well
By simulating different structures of vortex tools influence of the pressure drop in gas, through the results shown in Table 5 and Fig. (16), we can obtain the following conclusions: it is not that the longer the spiral section and the smaller the pitch, the better it is for gas well production
Considering the application of the vortex tools in the drainage process, various researches were done for the vortex tool through computational fluid dynamics method in this paper
Summary
With the rapid development of the natural gas industry, one of the main problems in natural gas deep exploitation is the liquid loading of gas well. The ability of gas to carry liquids is insufficient and results in liquid loading. This has seriously influenced the effective exploitation of natural gas [1]. Due to the effect of vortex, tool drainage is influenced by gas reservoir properties, mining methods and production condition, sometimes it can hardly earn desired effect. The results of trial have shown that the maximum increases in daily gas production of single well is 542.1m3/d and the minimum is 172.9m3/d, the effect of vortex tool is not apparent (detailed in Table 1) [4]. Research down hole fluid flowing regularity verifies the effect of drainage gas, calculates the gas well production parameters and the spiral structure of the vortex tools on the influence of the gas drainage
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