Vibration desulfurization tools and their self-excited oscillation module simulation and analysis

To address wellbore blockage and mechanical sticking caused by sulfur deposition in high-sulfur gas wells, a variable-diameter high-frequency vibration sulfur-removal tool was developed. This study focuses on the structural characteristics and performance evaluation of its self-excited oscillation module. A fluid simulation model based on the LBM-LES approach was established to investigate the effects of cavity length L and outlet diameter d2 on axial impact load and vibration frequency. The results indicate that increasing L enhances the impact load while reducing the dominant frequency, with L = 110 mm providing the best overall performance. The outlet diameter markedly affects impact loading, and d2 = 24 mm achieves higher impact amplitude with lower pressure loss. Scaled laboratory experiments were conducted to validate the numerical findings, showing discrepancies of less than approximately 20% in amplitude and 27% in dominant frequency. The validated results demonstrate that the proposed oscillation module can generate stable high-frequency axial impact, providing theoretical support for structural optimization and field application of high-frequency sulfur-removal tools.