采煤沉陷区油气管道泄漏风险量化分区研究

The study on the leakage risk of oil-gas pipeline in coal mining subsidence basin is essential to protect the pipeline's safety and maintain the stability of transportation projects. In this paper，the oil-gas pipelines in the loose layer of Ordos Basin are taken as the research object. First，the different coupling states between pipeline and soil are analyzed. And the mechanical models of elastic beam and elastic foundation beam are used to calculate the pipe deflection. Next，the deformation limit of the pipeline is calculated according to the industry code. And the reliability theory is used to link the pipeline's deformation and the leakage damage. Second，the pipeline deflection and its deformation limit are compared and segmented. The axial damage risk level of the pipeline was determined. On this basis，combined with the influence range of pipeline leakage，the quantitative partition method of pipeline leakage risk in subsidence basins is established. Meanwhile，the corresponding correction method and protection scheme are proposed. Finally，the engineering example is compared to the theoretical solution，and a good agreement is obtained. The results show that the risk level of pipeline damage increases with the gradual increase of pipeline deflection. At the same time，the impact area of leakage gradually increases. The method realizes the quantification of oil-gas pipeline leakage risk in subsidence basins，which is essential to increasing maintenance efficiency and protecting pipeline safety.