The leakage of petroleum pipelines has been widely concerned by people and surface transport characteristic of leakage contaminant is the basis of petroleum pipeline leakage detection technology application. This paper established a two-dimensional mathematical-physical model of buried petroleum pipelines leakage

and aimed at the surface transport process of leakage contaminant of buried petroleum pipelines

using the numerical simulation software

it is studied on the effect of different leakage aperture and location for the surface transport characteristic of leakage contaminant of buried petroleum pipelines. The results showed that at the early stage of leakage

the resistance of contaminant is uniform lead to it uniformly transport near areas around with fast speed and gradually decreased in later stage. It would reach the surface faster if the leakage aperture is more larger and the leakage location is more nearer the surface and the surface transport characteristics are more obvious at larger maximum horizontal displacement.