Research on Emergency Treatment Measures for Oil and Gas Pipeline Passing Though Mining Subsidence Area

With the continuous increase in the mileage of long-distance oil and gas pipelines in China, more and more pipelines need to pass through prospecting areas, mining areas and mined-out areas. In these areas, underground subsidence and surface cracking may occur due to over-exploitation of underground minerals, which may cause damage to buried oil and gas pipelines. In order to ensure the safety of the pipelines in these areas, it is necessary to put forward appropriate measures for the management of different mined-out areas. This is a new topic that needs further study for the mined-out area pipelines. This paper takes the geological disasters of the collapsible subsidence suffered by the Puxian-Hejin gas pipeline as an example, through the establishment of a settlement monitoring system for mined-out area and the analysis and verification of pipeline stress status, comprehensive physical survey, on-site monitoring data analysis, expert experience, calculation and analysis of pipeline stress, evaluation of geological safety in mined-out area, and emergency measures such as trench excavation, interception and drainage, weld protection, timely pipe lift, decompression and gas transmission, and monitoring and early warning measures to effectively reduce the risk of pipeline damage and ensure the safe operation of pipelines. The treatment measures have reference and reference significance for the treatment of oil and gas pipelines in mined-out areas.