Numerical analysis of erosion damage on the inner wall of buckling continuous tubing

In the perforating or drilling conditions, the high-speed liquid-solid two-phase flow will cause erosion damage to the pipe wall, resulting in thinning of the pipe, which will cause serious safety hazards to the oil and gas development and construction. In this paper, the liquid-solid two-phase flow is simulated by discrete particle two-phase numerical computation method to simulate the erosion of spiral flexing tubing, and the fluid motion characteristics, particle trajectory and inner wall erosion results are obtained under different pitch, different flow rate, different particle concentration and different particle size. The simulation results show that the erosion damage is mainly distributed in the vicinity of the helix, and the erosion rate gradually decreases with the increase of the pitch. With the increase of fluid velocity and particle concentration, the erosion rate increases. The effect of particle size on erosion is mainly reflected in the distribution of erosion and has a small effect on the extreme value of erosion rate. As the particle size increases, the kinetic energy of the particles increases, and the damage site is more concentrated on the outer side of the helix.