Friction between the drill string and the formation interface significantly affects drilling efficiency. To enhance drilling performance, we propose a dual-vortex jet oscillation tool. This tool utilizes internal dual-vortex channels to generate periodic oscillations to reduce friction and drag between the drill string and the wellbore. Based on the Re-normalization group k–epsilon turbulence model, the internal flow field is simulated to assess the influence of structural parameters and jet parameters on tool performance. First, an experimental platform for the dual-vortex jet element is constructed according to similarity criteria. Comparison of the results showed consistency between the simulation and experimental results, validating the tool's performance. Then, simulation analysis yielded average pressure drop, average axial force, and oscillation frequency with different structural parameters, preliminarily determining the optimal range for each parameter. Further, with the goal of minimizing the average pressure drop and axial force, response surface optimization analysis was conducted to explore the interactions between different parameters and determine the optimal structural parameters. Finally, the flow field characteristics of the initial model and the optimized model were compared and analyzed. The results show that the optimized model reduces both pressure drop and axial force, proving the correctness of the optimization results.
Tian et al. (Mon,) studied this question.