Numerical Simulation on Leakage Diffusion Process of Buried Oil-Gas-Water Pipeline

摘要

Buried pipeline is very easy to be corroded and leaked, and will do pollution to the surrounding environment and accompanied with huge energy loss. With the buried pipelines as the research object, considering the phase transition effect of crude oil's solidification, a coupling model of the flowing and heat transfer of oil-gas-water three-phase in the soil's porous media was built. With Finite Volume Method and SIMPLEC algorithm of coupling of pressure and velocity, and applying the VOF (Volume of Fluid ) Model and Solidification&Melting Model, the numerical simulation of the leakage process of oil-gas-water multiphase flow in buried pipeline was done, and has determined influence of oil-gas-water three-phase flow and oil's solidification melting on the leak process of buried pipeline. The results showed that: (1) the leaked oil's solidification amount was first increased, then decreased, and the solidification phase diffused as arc towards the surface; (2) due to the stress in porous media and layer, the biggest vertical penetrating depth of leaked oil was 5.3 m; (3) the maximum range of piping radial diffusion of leaked oil already had amounted to 4.5m at 20000s.