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A Prediction Model of Local Corrosion Rate with Six Factors Containing Carbon Dioxide and Hydrogen Sulfide

A local corrosion, carbon dioxide technology, used in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc.

Active Publication Date: 2022-08-09
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the corrosion failure accidents of oil and gas pipelines are mostly caused by local corrosion, there is no mature local corrosion rate prediction model at present. Therefore, the present invention establishes a six-factor local The corrosion rate prediction model solves the problem of oil and gas pipeline corrosion prediction in a targeted manner and protects the integrity of oil and gas pipelines

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  • A Prediction Model of Local Corrosion Rate with Six Factors Containing Carbon Dioxide and Hydrogen Sulfide
  • A Prediction Model of Local Corrosion Rate with Six Factors Containing Carbon Dioxide and Hydrogen Sulfide
  • A Prediction Model of Local Corrosion Rate with Six Factors Containing Carbon Dioxide and Hydrogen Sulfide

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Embodiment Construction

[0019] A six-factor local corrosion rate prediction model containing carbon dioxide and hydrogen sulfide is established on the basis of basic theory through three steps:

[0020] The first step: establish a local corrosion rate calculation function model including six factors of common corrosive environment of oil and gas pipelines,

[0021]

[0022] where: f x (x) is the influence function of the x factor, C is the constant term, and a~g are the coefficient terms of each factor;

[0023] Step 2: Combined with the corrosive environment of oil and gas pipelines, there are six factors that do not appear at the same time. When a certain factor does not exist, this function can automatically return to zero to calculate the corrosion rate value of other factors.

[0024] The third step: Determine the local corrosion rate under different working conditions through the experimental data of the high temperature and high pressure reactor. The linear regression algorithm was used ...

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Abstract

The invention discloses a six-factor local corrosion rate prediction model containing carbon dioxide and hydrogen sulfide, which considers CO 2 partial pressure, H 2 S partial pressure interactive corrosion effect can be calculated including flow rate, Cl ‑ Concentration, CO 2 partial pressure, H 2 The local corrosion rate of oil and gas pipelines including S partial pressure, pH value and temperature; and the mathematical method is used to optimize the design, and the model can be used in the absence of any factors; a six-factor local corrosion rate prediction model containing carbon dioxide and hydrogen sulfide has been tested. It has high prediction accuracy, provides a mathematical calculation method for local corrosion prediction of oil and gas pipelines, and is of great significance to the development of oil and gas pipeline integrity management.

Description

technical field [0001] The invention relates to a six-factor local corrosion rate prediction model containing carbon dioxide and hydrogen sulfide, and relates to the field of oil and gas pipeline corrosion prediction. Background technique [0002] With the continuous development of oil and gas resources, more and more oil and gas pipelines are transported. However, as the service time of the pipeline continues to increase, the risk of internal corrosion failure increases. If leakage occurs, it will not only bring serious economic losses, but also cause large-scale pollution. Therefore, it is necessary to study the corrosion behavior and corrosion prediction in oil and gas pipelines in order to reduce the risk of corrosion failure. [0003] The degree of corrosion in oil and gas pipelines is mainly related to the transport medium in the pipeline, operating conditions and other factors, including temperature, pressure, flow rate, corrosive medium, etc. Unfortunately, there i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 覃敏廖柯熹何国玺张世坚赵帅
Owner SOUTHWEST PETROLEUM UNIV