Deformation Monitoring and Risk Assessment Method and Application Practice of Shallow Buried Oil and Gas Pipelines under the Influence of Mining
At present,China's oil and gas resources are mainly transported in the form of buried pipelines.The surface movement and deformation caused by mining when crossing goaf will inevitably have a certain impact and harm on the buried oil and gas pipelines.The Jining Branch Pipeline of the Shandong-Anhui Pipeline passes through Dongtan Coal Mine of Yankuang Energy Group Company Limited,and the nearest horizontal distance from the 3308 working face in mining area 3 is only 85 m.In order to ensure the safety of the Jining Branch Pipeline of the Shandong-Anhui Pipeline and realize the safe and efficient mining of the 3308 working face,a monitoring and evaluation method for shallow buried oil and gas pipelines and sur-face deformation is proposed.Based on the actual measurement of surface movement and deformation of the 3308 working face and the monitoring data for pipeline stress,the characteristics of surface deformation along the Jining Branch Pipeline of the Shandong-Anhui Pipeline and its impact on the pipeline are studied,and the changes of pipeline monitoring stress under the in-fluence of mining are analyzed.On this basis,the current risk of buried pipelines affected by mining is evaluated,and the pipe-line protection measures are proposed.The results show that the surface subsidence and slope deformation caused by the mining of 3308 working face have little impact on the pipeline deformation,and the current stability level of the surface along the pipe-line is Grade Ⅳ,with low risk.The surface movement and deformation have a certain impact on the stress state of the pipeline,especially the initial mining area is close to the pipeline,and the surface along the pipeline is more active,leading to the in-crease of the axial stress of the pipeline.A certain period of stress monitoring practice was carried out for the pipeline,and the monitoring results were lower than the third level threshold value of the pipeline early warning specification.The pipeline opera-tion was always in a green and risk-free range.In the future,measures should be continued to be taken to monitor the deforma-tion and daily protection of the goaf site and buried oil and gas pipelines.The study results have certain reference significance for safe and efficient coal mining under buried oil and gas pipelines.
mining subsidenceoil and gas pipelinesurface deformationrisk assessmentpipeline protection
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