Pipeline leakage characteristics under water–oil mixed migration model

With the increase in long distance oil pipeline mileage, leakage caused by pipeline corrosion has become an important safety problem. In order to study the characteristics of pipeline leakage, a lake district was selected as the research object, two-dimensional shallow water equation was used as the basic control equation, and the hydrodynamic model of the lake district was established using the hydrodynamic module of MIKE21 software. Based on oil particle method and coupled particle tracking module, the mixed migration model of water–oil dual system was established. The diffusion process and law of pipeline leakage in water body are studied, and the influence law of wind field, water level, and leakage aperture change on leakage diffusion is compared and analyzed. The study shows that the wind field has the most significant effect on the oil film diffusion trajectory and diffusion velocity. The increase in water level will reduce the diffusion rate of oil particles, and the increase in leakage aperture will significantly increase the oil film concentration, but it has little effect on the diffusion trajectory.