Construction method of in-service oil and gas pipelines encountering goaf collapse and damage

Abstract

The invention relates to a restoration construction method for an in-service oil gas pipeline which encounters with the collapse and destruction of a worked-out section, and relates to the technical field of pipeline systems. The restoration construction method comprises the following steps of: 1) preparing construction; 2) performing Redi positioning on the pipeline, and laying the pipeline; 3) cleaning an operating zone and excavating a pipe ditch artificially; 4) releasing the stress of the pipeline; 5) measuring coordinates of a pipeline body and arranging a stress monitoring device at the key position of the pipeline body; 6) analyzing the stressed condition of the pipeline, and determining a pipe section to be lifted and calculating the lifting height of the pipeline; 7) distributing hanging points, and performing ultrasonic detection on key weld joints; 8) determining the single-pass lifting height of each hanging point; 9) lifting the pipeline for multiple times, and detecting the internal condition of the key weld joints and stress values at key positions of the pipeline for multiple times; 10) retesting the scale height of the pipeline; 11) ramming and filling gaps at the pipe bottom; 12) releasing the hanging points; 13) performing the ultrasonic detection on the weld joints; 14) repairing cuts of an anticorrosive coating; and 15) restoring the pipeline.

Description

technical field [0001] The invention relates to a restoration construction method for in-service oil and gas pipelines that have suffered natural disasters such as goafs and geological subsidence. It relates to the technical field of piping systems. Background technique [0002] In recent years, with the rapid development of my country's long-distance pipelines, my country's pipeline network construction has formed a certain scale, but the factors that endanger the safe operation of pipelines are increasing. Among them, because the long-distance pipeline passes through some coal-producing areas, it will inevitably pass through the top of the coal field. Because some areas pursue profit maximization (coal mining is not in accordance with regulations), disorderly mining causes goaf subsidence, implicating the sinking of the pipeline , resulting in stress deformation of the pipeline, when the stress deformation of the pipeline approaches the limit value, it will endanger the l...

AI Technical Summary

Problems solved by technology

Among them, because the long-distance pipeline passes through some coal-producing areas, it will inevitably pass through the top of the coal field. Because some areas pursue profit maximization (coal mining is not in accordance with regulations), disorderly mining causes goaf subsidence, implicating the sinking of the pipeline , resulting in stress deformation of the pipeline. When the stress and deformation of the pipeline approach the limit value, it will endanger the life and property safety of the pipeline and the nearby people, and the consequences and impacts are inestimable.

[0003] In Shanxi Province of the West-East Gas Pipeline, there are two coal mine goafs with pile numbers EHM072 and EHM091-EHM092 that have collapsed and caused the surface to sink, endangering the safety of the pipeline

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