Pipeline suspension failure prediction method under flood action

Abstract

The invention discloses a pipeline suspension failure prediction method under flood action. The method comprises the steps of setting a value of a suspension coefficient of a pipeline; calculating a flood hydrograph of a river through which the pipeline passes; according to the flood hydrograph, calculating the change relation of the flood speed along with time; calculating the change relation ofthe pipeline suspension length along with time according to the suspension coefficient of the pipeline; performing finite element modeling on the basis of the change relation of the flood speed alongwith time and the change relation of the pipeline suspension length along with time, calculating the change rule of the mechanical behavior of the pipeline along with time through time-history analysis, and predicting the yield time of the pipeline. According to the method, the change relation between the suspension length of the pipeline and the flood flow rate along with time is calculated by utilizing the set suspension coefficient and the obtained flood hydrograph, modeling is carried out in finite element analysis by utilizing the relation, and the yield time of the pipeline is predicted,so that the emergency time is obtained.

Description

technical field [0001] The invention belongs to the technical field of oil and gas pipeline protection, in particular to a method for predicting failure of pipeline suspended in the air under flood action. Background technique [0002] Over the past 10 years, China's long-distance oil and gas pipelines have developed rapidly, and oil and gas are known as "the blood of industry". With the rapid development of China's economy and the improvement of people's living standards, the oil and gas industry will continue to develop vigorously. According to the "Medium and Long-term Oil and Gas Development Plan" issued by the National Development and Reform Commission and the National Energy Administration, as of 2018, the mileage of my country's crude oil, refined oil, and natural gas pipelines has reached 136,000 kilometers, and it is estimated that by 2020, the mileage of my country's oil and gas pipelines will reach 169,000 It is planned that by 2025, the total mileage of oil and ga...

AI Technical Summary

Problems solved by technology

Geological disasters have become the main risk of pipeline safety, especially under the action of floods, the process of pipeline suspension is rapid, maintenance and repair are difficult, difficult to control, and the consequences of failure are very serious

The failure of crossing pipelines is not only a huge economic loss, but the environmental pollution caused by crude oil leakage has an even more immeasurable impact on the ecology

[0004] At present, the risk prevention and control of pipelines under the action of floods mainly focuses on the research on the carrying capacity of crossing pipelines, but there are few studies on the changes in the mechanical behavior of pipelines with time under the action of floods. However, for flood fighting and rescue and emergency repair of pipelines It is particularly important to reasonably estimate the time-varying law of dynamic mechanics of suspended pipelines under the action of floods, and to provide a basis for the threshold setting of the early warning and forecast platform in combination with the changing laws of pipeline space mechanical behavior.

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