Research of throwing areols of underground pipeline in permafrost

Study is due to the possibility of loss of stability of the pipeline in the process of pumping a product with a positive operating temperature and the formation of thawing halos. The article presents the ways of solving the thermomechanical problem of pipeline displacement due to thawing. The rate of formation of a thawing halo is investigated depending on the initial temperatures of the soil and the pumped product. The developed monitoring system makes it possible to study the rate of occurrence of thawing halos in the process of pumping the product. An experimental study on the formation of thawing halos around the pipeline was carried out on an experimental model. A thermophysical comparative calculation of temperatures around the pipeline on a model by the finite element method has been carried out. Keywords: underground pipeline; permafrost; thawing halo; monitoring; operating conditions; stress–strain state.

Application of Geological Radar Method in Exploration of Reservoir Complex Pipelines

Geodesic radar method is a non-destructive geophysical method to detect underground geological structure based on the differences in conductivity, magnetism and dielectric constants of different substances. This method has the advantages of economy, fast, continuous, accurate, non-destructive, non-contact, etc. It is applicable to both metal and non-metal pipelines, and it is the preferred tool for underground pipeline detection. In this paper, the geological radar method is used to detect the complex pipe network around Daning Reservoir in detail by laying out multiple detection lines. It provides basic support for the later pipe network rectification. The research results can provide experience for the detection of the complex pipe network in the urban reservoir.