天然气集输倾斜管道腐蚀行为及缓蚀剂分布研究

doi:10.11902/1005.4537.2024.119

中国腐蚀与防护学报

2025, Vol. 45

Issue (3): 780-786 CSTR: 32134.14.1005.4537.2024.119 DOI: 10.11902/1005.4537.2024.119

研究报告

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天然气集输倾斜管道腐蚀行为及缓蚀剂分布研究

侯晓犇¹, 刘宁²^,³, 扈俊颖²(

)

^1.中国石油化工股份有限公司西南油气分公司采气三厂德阳 610041
^2.西南石油大学石油与天然气工程学院成都 610500
^3.国家石油天然气管网集团有限公司湖南分公司长沙 410016

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

引用本文:

侯晓犇, 刘宁, 扈俊颖. 天然气集输倾斜管道腐蚀行为及缓蚀剂分布研究[J]. 中国腐蚀与防护学报, 2025, 45(3): 780-786.
Xiaoben HOU, Ning LIU, Junying HU. Corrosion Behavior and Distribution of Corrosion Inhibitors in Inclined Section for Natural Gas Gathering and Transportation Pipelines[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 780-786.

全文: PDF(4717 KB) HTML

摘要:

通过实验+ CFD模拟研究了倾角为30°的天然气集输管道在气液两相流下的腐蚀行为及连续加注型缓蚀剂的分布规律和缓蚀效率。结果表明：当气相流速为3 m/s、携液量为7.5%时在倾角30°的管道中弯管段和倾斜段气液两相流转变为段塞流，使其成为腐蚀的主要区域，与现场集输管道腐蚀刺漏部位吻合。电化学测试与Fluent模拟结果均表明缓蚀剂在管道顶部和底部的浓度分布沿管道轴向均呈现先上升后降低的趋势，管道底部浓度高于相应部位的顶部浓度；管道底部倾斜段的腐蚀速率最大，表明缓蚀剂在倾斜管段处的覆盖度最小。

关键词 ：倾斜管道, 气液两相流, 连续加注型缓蚀剂, CFD模拟

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

收稿日期: 2024-04-10 32134.14.1005.4537.2024.119

ZTFLH:

TE257

通讯作者: 扈俊颖，E-mail：hujunying01@yeah.net，研究方向为油气田腐蚀与防护

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

作者简介: 侯晓犇，男，1985年生，硕士，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.119 或 https://www.jcscp.org/CN/Y2025/V45/I3/780

图1 30°倾斜管道内气液两相分布云图

图2 30°倾斜管道内压力和速度分布云图

图3 30°倾斜管道内不同横截面处液相流量

图4 管道内不同位置处电极的Nyquist图及等效电路

表1 30°倾斜角度下不同位置处电极的电化学阻抗拟合数据结果

图5 30°倾斜管道内不同位置处电极的SEM像

图6 缓蚀剂在30°倾斜管道中的浓度分布图

图7 30°倾斜管道内距管道入口不同处截面的缓蚀剂浓度分布图

图8 30°倾斜管道内不同部位处电极的Nyquist图

表2 30°倾斜管道内1~7号电极电化学阻抗谱的拟合结果

图9 3个典型电极表面AFM图像

图10 缓蚀剂在不同入口速度下的浓度分布

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