Experimental study on the leakage temperature field of buried CO2 pipelines

Abstract

In view of the fact that the leakage of small holes in the buried CO 2 pipeline is not easy to be detected, which leads to the problem of inability to accurately trace the source of the pipeline repair in the later stage. This paper designs and establishes a buried CO 2 pipeline leak simulation experiment system and conducts experiments on small-hole leaks in buried CO 2 pipelines to investigate the changes in soil temperature around the CO 2 pipeline leaks. The results showed that the type of movement of CO 2 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 CO 2 pipelines and accurately determine their leakage status.

Comprehensive Review on Leakage Characteristics and Diffusion Laws of Carbon Dioxide Pipelines

“…Liu et al 126 conducted a study using thermocouples in soil pits to measure the temperature variations resulting from carbon dioxide leakage from buried pipelines (Figure 27). The research showed that the temperature distribution within the soil medium formed a funnel-shaped pattern.…”

“…Three-dimensional diagram of the temperature distribution at different locations in soil . Reproduced with permission from ref . Copyright 2023 SPRINGER NATURE.…”