Heat Effect Analysis of Buried Oil Pipeline in the Qinghai-Tibet Plateau

Abstract

The Geermu-Lasa oil pipeline was located in the Qinghai-Tibet Plateau permafrost regions. The building and operating of pipeline will change the temperature field of soil around it, which can lead to changes of frozen soil mechanic properties, and this will induces deformation or even fracture of pipeline. These phenomena will affect the normal transportation of oil. In this paper, temperature field around the pipelines were analyzed due to different pipe diameters and different insulation layer thicknesses in the way of finite element method. The rule of thawing and freezing of soil around the pipeline in an annual cycle was obtained. Artificial permafrost table variations under the pipeline were also obtained due to different operating conditions. For 30cm diameter pipeline with 7cm insulation layer, its artificial permafrost table depth change value is just 0.48m after 30-year running. These analysis results can provide references to the construction of the new Geermu-Lasa oil pipeline.

Pipeline Stress Test Simulation Under Freeze-Thaw Cycling via the XGBoost-Based Prediction Model

“…Pores are formed between the pipe and the soil, and the pipeline may be broken by additional stresses (Boguchevskaya et al, 2016;Wu et al, 2010). The generation of soil frost heave force is aggravated by high moisture content (Jin et al, 2010;Li et al, 2010;Liu et al, 2014;Dvoskina et al, 2015). The above problems concern all buried oil pipelines that pass through seasonally frozen soil areas.…”