The multi-branch zone fracturing sandblaster accommodates regional fracturing requirements, enabling fracturing across larger blocks and extended zones. To investigate erosion-wear characteristics of the coiled tubing (helical tube) in the tool's helical section and elucidate key influencing factors and mechanisms, numerical simulations were conducted based on erosion models and solid–liquid two-phase flow theory using computational fluid dynamics. This study analyzes the effects of flow field characteristics, sand-carrying fluid properties, pipe diameter, pitch, and spiral diameter on helical tube erosion wear. Based on the structural configuration and model parameters, results indicate that helical pipe erosion wear decreases with increasing pipe diameter, pitch, and helical diameter. In contrast, it intensifies with rising particle mass flow rate and inlet velocity of sand-carrying fluid. Additionally, erosion first increases and then decreases as particle size grows. Particle size significantly affects helical tubing erosion wear; as particle size increases, the maximum erosion rate rises first and then declines. From the coupling effects of fluid properties and structural features, large particle sizes make the inlet velocity a dominant factor for the erosion rate. Higher inlet velocity and mass flow rate lead to more severe erosion. With increased pipe and spiral diameters of helical tubing, the influence of particle size variation on erosion rate gradually weakens.
Kong et al. (Mon,) studied this question.