Simulation study demonstrates enhanced oscillation frequency from dual vortex drag reduction tools in coiled tubing drilling, highlighting improved tool design.
Vortex drag reduction tool based on wall attachment effect has simple structure and high reliability, and has wide application scenarios in coiled tubing drilling. And now, the research on this tool mostly focuses on the impact of wall attachment effect on tool oscillation performance, and the research on the impact of vortex number on tool oscillation performance is less. Therefore, this paper establishes a numerical model of vortex drag reduction tool based on Computational fluid dynamics, Analyze and compare the oscillation performance generated by single vortex drag reduction tools, double vortex drag reduction tools, three vortex drag reduction tools, and four vortex drag reduction tools. The research results show that all four drag reduction tools can produce good oscillation performance. The drag reduction tool using positive feedback method produces better oscillation performance than the reverse feedback method, while the dual eddy current drag reduction tool can generate better pressure drop and oscillation frequency compared to the other three eddy current drag reduction tools, and the oscillation process is also more stable. The results of this study have important guidance for the rational optimum design of vortex structure parameters drag reducing tool.
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xue et al. (2024) studied this question.
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