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Method and apparatus for dynamically and safely determining corrosive defects inside conveying pipeline

A technology for transportation pipelines and internal corrosion. It is used in measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc. It can solve the problem of difficulty in dynamically and accurately assessing the safety status of oil and gas transportation pipelines with corrosion defects.

Active Publication Date: 2017-08-18
PETROCHINA CO LTD
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Problems solved by technology

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a dynamic safety assessment method for internal corrosion defects of oil and gas transmission pipelines, which solves the problem that it is difficult to dynamically and accurately assess the safety status of oil and gas transmission pipelines with corrosion defects in the prior art

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  • Method and apparatus for dynamically and safely determining corrosive defects inside conveying pipeline
  • Method and apparatus for dynamically and safely determining corrosive defects inside conveying pipeline
  • Method and apparatus for dynamically and safely determining corrosive defects inside conveying pipeline

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Embodiment 1

[0068] This embodiment firstly provides a dynamic safety assessment device for corrosion defects inside the pipeline, the structure of which is as follows: figure 1 As shown, the dynamic safety assessment device for corrosion defects inside the pipeline includes:

[0069] The parameter acquisition module is used to obtain the common metal materials of the pipeline in different CO 2 Partial pressure, H 2 S partial pressure, chloride content and corrosion growth rate at different stress levels;

[0070] The mathematical model building module is used to use the adaptive neuro-fuzzy inference system to establish the 2 Partial pressure, H 2 Mathematical models of S content, chloride content, stress level and corrosion growth rate;

[0071] Prediction module, used to obtain CO 2 Partial pressure, H 2 S content, chloride content, stress level, based on the established mathematical model, predict the corrosion growth rate;

[0072] The evaluation module is used to establish the...

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Abstract

The invention provides a method and an apparatus for dynamically and safely determining corrosive defects inside a conveying pipeline. The method comprises the following steps: acquiring a corrosion expansion rate of a conventional metal material for a conveying pipeline under different CO2 partial pressure, H2S partial pressure, chloride contents and different stress levels; establishing a mathematic model of the corrosion expansion rate by utilizing a self-adaptive neural-fuzzy inference system according to the acquired corrosion expansion rate; acquiring the CO2 partial pressure, a H2S content, the chloride content and the stress level of a pipe section at which a corroded portion of the pipeline is located, and predicting the corrosion expansion rate according to the established mathematic model; and establishing a pipeline limit-state equation, and acquiring a safety state of the pipeline. The invention also provides the apparatus for dynamically and safely determining the corrosion defects inside the conveying pipeline. By adopting the method and the apparatus for dynamically and safely determining the corrosion defects inside the conveying pipeline, the problem that the safety state of the oil-gas conveying pipeline containing the corrosion defects is difficult to determine dynamically and accurately can be solved.

Description

technical field [0001] The invention relates to an evaluation method and device, in particular to a method and device for dynamic safety evaluation of corrosion defects inside a transmission pipeline, belonging to the technical field of petroleum exploitation. Background technique [0002] Natural gas is a high-quality energy and chemical raw material. With the rapid economic development, the social demand for natural gas resources is increasing rapidly. Usually large oil and gas fields are distributed in some remote areas, while the demand for natural gas is mainly concentrated in industrially developed urban areas. Therefore, in the natural gas industry, transportation becomes as important an issue as collection. [0003] Among the many transportation methods, pipeline transportation has become the most important way to transport natural gas resources due to its advantages of low cost, large transportation volume and high reliability. However, in the process of oil and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02G01N33/20
CPCG01N17/02G01N33/20
Inventor 武玮程光旭李云胡海军李凯凯
Owner PETROCHINA CO LTD
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