Experimental study on the leakage temperature field of buried CO₂ pipelines

The leakage of small holes in the buried CO₂ pipeline is not easy to detect, which leads to the problem of the inability to accurately trace the source of the pipeline repair in the later stage. This paper designs and builds an experimental system to simulate the leakage of buried CO₂ pipelines and conducts experiments on the leakage of small holes in buried CO₂ pipelines to investigate the changes in the surrounding soil temperature when they leak. The results showed that the type of movement of CO₂ in porous media after it is released from the leak is "funneling." At a distance of about 50 mm from the horizontal, the temperature difference in the horizontal surface is smallest at the 50 cm closest to the vertical distance of the leak, while at a distance of 225 mm from the horizontal, the temperature difference in the horizontal surface is largest at the 70 cm farthest from the vertical distance of the leak. The research results can provide a theoretical basis for the later development of technologies that can quickly locate the leakage points of buried CO₂ pipelines and accurately determine their leakage status.