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CO2 corrosion rate prediction method considering influence of corrosion product film

A corrosion product and corrosion rate technology, applied in chemical process analysis/design, instrumentation, computational theoretical chemistry, etc., can solve problems such as application limitations, complex production environment, and only applicable models

Active Publication Date: 2020-10-20
SOUTHWEST PETROLEUM UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although in a specific corrosion environment, the predictions of these models are more in line with the actual situation on site, but the foundations of different prediction models are different, and the influencing factors of concern and their corresponding weights are also different, resulting in that specific models are only applicable to specific environment, the application is limited
With the continuous development of the oil and gas industry, the production environment faced by people will only become more and more complex, making these empirical / semi-empirical models gradually no longer applicable

Method used

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  • CO2 corrosion rate prediction method considering influence of corrosion product film
  • CO2 corrosion rate prediction method considering influence of corrosion product film
  • CO2 corrosion rate prediction method considering influence of corrosion product film

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Experimental program
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Effect test

Embodiment 1

[0115] On the basis of the corrosion prediction research carried out by nesic et al. (2010), combined with the published corrosion experimental conditions, experimental data and the classic corrosion experience / semi-empirical model proposed by the predecessors, the CO 2 Corrosion rate prediction model calculations were compared and verified. The specific implementation calculation results are as follows:

[0116] (1) The effect of temperature on low carbon steel CO 2The influence of corrosion rate, the experimental conditions are as follows: pH=4, ID=100mm, single phase pipe flow. Corrosion rate prediction method prediction value of the present invention and experimental value, people's prediction value such as nesic, de waard1991 semi-empirical model prediction value comparison see Figure 5 .

[0117] (2) CO 2 partial pressure on mild steel CO 2 The influence of corrosion rate, the experimental conditions are as follows: 60°C, pH=5, v=1m / s, ID=100mm, single-phase pipe...

Embodiment 2

[0120] Combined with Ma Hong et al.'s (2018) research on the influence of pipeline operating parameters on the corrosion behavior of No. 20 steel in the conveying medium, the CO proposed in the present invention 2 The calculation of the corrosion rate prediction model is compared and verified, and the prediction result is corrected by using the corrosion product film influence factor proposed by the present invention. The specific implementation calculation results are as follows:

[0121] (1) The experimental conditions are as follows: the experimental medium is formation water, the total pressure is 0.5MPa, CO 2 The partial pressure is 0.1MPa, the flow velocity is 1.5m / s, and the test time is 48 hours. According to the experimental conditions, the prediction value of the corrosion rate prediction method of the present invention is compared with the experimental value. Figure 10 After comparison, it is found that when the experimental temperature exceeds 60°C, the predicte...

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Abstract

The invention discloses a CO2 corrosion rate prediction method considering the influence of a corrosion product film, and belongs to the technical field of oil and gas field corrosion protection. Themethod comprises the following steps: firstly, carrying out chemical equilibrium calculation on a CO2 solution system, determining a main electrochemical reaction in a corrosion process, and establishing an electrochemical model by utilizing a Butler-Volmer equation; establishing a mass transfer model by utilizing a Colburn j factor analogy method and a prepared corrosion product film factor, wherein the corrosion product film factor can be obtained by back calculation of a corrosion mechanism model according to the corrosion rate measured by an experiment; and finally, obtaining a corrosion potential by combining a mixed potential theory, and further calculating to obtain the corrosion rate. According to the invention, the multi-field coupling effect is considered, based on the corrosionreaction mechanism and mathematical derivation, an oil and gas pipeline CO2 corrosion prediction mechanism model is established, the situation that a theoretical prediction value is too high in the presence of the corrosion product film is considered, a prediction result is corrected by the prepared corrosion product film factor, the accuracy of corrosion prediction is improved, and good extrapolation and flexibility are achieved.

Description

technical field [0001] The invention discloses a CO 2 A corrosion rate prediction method belongs to the technical field of oil and gas field corrosion protection. Background technique [0002] CO 2 Corrosion is the most common and serious corrosion problem in the oil and gas chemical industry. With the continuous development of my country's CCUS (Carbon Capture / Utilization / Storage) technology, CO 2 Oil flooding technology has been widely used in major oil fields, but it also leads to CO 2 As an associated gas, it will cause serious corrosion to oil casing and gathering pipelines. With CO 2 With the continuous deepening of mechanism research and the continuous development of prediction models, more empirical / semi-empirical models have been developed into commercial software and applied to various engineering practices. Among them, the most used in the industrial field is De Waard and Dugstad in the 1990s. A series of empirical / semi-empirical models proposed by et al. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/10G16C10/00
CPCG16C20/10G16C10/00
Inventor 蒋宏业刘映雪
Owner SOUTHWEST PETROLEUM UNIV