Corrosion Behavior and Distribution of Corrosion Inhibitors in Inclined Section for Natural Gas Gathering and Transportation Pipelines

doi:10.11902/1005.4537.2024.119

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (3): 780-786 DOI: 10.11902/1005.4537.2024.119

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Corrosion Behavior and Distribution of Corrosion Inhibitors in Inclined Section for Natural Gas Gathering and Transportation Pipelines

HOU Xiaoben¹, LIU Ning²^,³, HU Junying²(

)

^1.Southwest Oil and Gas Branch of China Petroleum and Chemical Corporation, Deyang 610041, China
^2.School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China, 3 PipeChina Hunan Branch, Changsha 410016, China
^3.PipeChina Hunan Branch, Changsha 410016, China

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HOU Xiaoben, LIU Ning, HU Junying. Corrosion Behavior and Distribution of Corrosion Inhibitors in Inclined Section for Natural Gas Gathering and Transportation Pipelines. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 780-786.

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Abstract

The corrosion behavior of a pipeline with an inclination of 30° in gas-liquid two-phase flow, the distribution and the inhibition efficiency of corrosion inhibitors were studied by experiment and CFD simulation. The results indicate that in case of the gas phase flow rate of 3 m/s while carrying 7.5vol.% liquid, the gas-liquid two-phase flow in the bent and inclined sections transforms into slug flow, thereby, where become the main areas subjected to corrosion, which is consistent with the detected locations of pipeline leakage at the gas field site. Results of electrochemical test and the fluent simulation indicate that the concentration distribution of corrosion inhibitors at the top and bottom of the pipeline shows a trend of first increasing and then decreasing along the pipeline axis, the concentration at the bottom of the pipeline is higher than the corresponding concentration at the top of the corresponding part. The corrosion rate of the electrode in the inclined section is the highest, indicating the minimum coverage of the corrosion inhibitor at the inclined section.

Key words: inclined pipeline gas-liquid two-phase flow continuous injection type corrosion inhibitor CFD simulations

Received: 10 April 2024 32134.14.1005.4537.2024.119

ZTFLH:

TE257

Corresponding Authors: Hu Junying, E-mail: hujunying01@yeah.net

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.119 OR https://www.jcscp.org/EN/Y2025/V45/I3/780

Fig.1 Cloud maps of distributions of gas and liquid phases in the pipeline with 30° inclination angle

Fig.2 Cloud maps of pressure distribution and velocity distribution in the pipeline with 30° inclination angle

Fig.3 Flows of liquid phase at the different cross-sectional positions of the pipeline with 30°inclination angle: (a) horizontal section, (b) bend section, (c) inclined section

Fig.4 Nyquist diagrams of the electrodes at the different positions inside the pipeline (a) and corresponding equivalent circuit model (b)

Table 1 Fitting data of electrochemical impedance spectroscopies of the electrodes at the different positions of the pipeline with 30° inclination angle

Fig.5 SEM images of the electrodes at the different positions of the pipeline with 30° inclination angle: (a) horizontal section, (b) bend section, (c) inclined section

Fig.6 Concentration distribution of corrosion inhibitor in the pipeline with 30° inclination angle

Fig.7 Maps of concentration distribution of corrosion inhibitor on the cross sections with 0.1 m (a), 0.3 m (b), 0.5 m (c), 1.9 m (d) and 2.1 m (e) from the inlet of 30° inclined pipeline

Fig.8 Nyquist plots of the electrodes at the different locations of 30° inclined pipeline

Table 2 Fitting results of EIS of the electrodes No.1-7 in 30 inclined pipeline

Fig.9 AFM surface images of three typical electrodes No.3 (a), No.5 (b) and No.7 (c)

Fig.10 Concentration distributions of the inhibitor at the top (a) and bottom (b) of the pipeline under the condition of different inlet velocities

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