某油田地面集输管道用材腐蚀行为研究

doi:10.11902/1005.4537.2019.230

中国腐蚀与防护学报

2019, Vol. 39

Issue (6): 557-562 DOI: 10.11902/1005.4537.2019.230

研究报告

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某油田地面集输管道用材腐蚀行为研究

赵国仙¹,黄静¹(

),薛艳²

1. 西安石油大学材料科学与工程学院西安 710065
2. 西安摩尔石油工程实验室股份有限公司西安 710065

Corrosion Behavior of Materials Used for Surface Gathering and Transportation Pipeline in an Oilfield

ZHAO Guoxian¹,HUANG Jing¹(

),XUE Yan²

1. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China
2. Xi'an Maurer Petroleum Engineering Laboratory, Co. , Ltd. , Xi'an 710065, China

全文: PDF(2202 KB) HTML

摘要:

模拟油田现场腐蚀环境，利用高温高压实验设备辅以失重法研究了某油田地面集输管道正在使用中的管材20G钢、L245钢、5Cr钢、316L不锈钢和板材16Mn钢在不同温度和CO₂分压下的腐蚀行为，并采用扫描电镜 (SEM)、电子能谱 (EDS) 和X射线衍射 (XRD) 等方法对腐蚀产物的形貌及成分进行分析。结果表明：20G钢、L245钢、5Cr钢、16Mn钢和316L不锈钢均在温度一定的情况下，随CO₂分压的增大，平均腐蚀速率先增大后减小；在CO₂分压一定的情况下，平均腐蚀速率随温度的升高先增大后减小。在温度为80 ℃，CO₂分压为0.5 MPa时，均达到最大平均腐蚀速率。20G钢、L245钢、5Cr钢和16Mn钢的腐蚀形貌为不均匀的全面腐蚀，腐蚀产物主要为FeCO₃，316L不锈钢由于在腐蚀介质中发生钝化，腐蚀形貌为轻微的点蚀。

关键词 ：集输管道, 腐蚀速率, 气相, 液相

Abstract：

The corrosion behavior of 20G steel, L245 steel, 5Cr steel, 16Mn steel and 316L stainless steel in CO₂ containing fluids at different temperatures and pressures was assessed by weight loss method via an autoclave, which aims to simulate the operating situation of the field. Then the morphology and composition of corrosion products were characterized by scanning electron microscopy (SEM), electronic energy spectrum (EDS) and X-ray diffraction (XRD). The results show that the average corrosion rate of 20G steel, L245 steel, 5Cr steel, 16Mn steel and 316L stainless steel increases first and then decreases with the increase of CO₂ partial pressure at a given temperature, and with the increase of temperature by a given CO₂ partial pressure respectively. The maximum average corrosion rate of the five materials emerged at 80 ℃ and 0.5 MPa of CO₂ partial pressure. 20G steel, L245 steel, 5Cr steel and 16Mn steel were suffered from non-uniformly general corrosion with corrosion products composed mainly of FeCO₃. Whilst 316L stainless steel was passivated with slight pitting corrosion in the corrosive medium.

Key words： gathering pipeline corrosion rate gas phase liquid phase

收稿日期: 2019-03-27

ZTFLH:

TG172.8

基金资助:西安石油大学研究生创新与实践能力培养计划(YCS18213110)

通讯作者: 黄静 E-mail: 842587939@qq.com

Corresponding author: Jing HUANG E-mail: 842587939@qq.com

作者简介: 赵国仙，女，1968年生，博士，教授

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引用本文:

赵国仙,黄静,薛艳. 某油田地面集输管道用材腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(6): 557-562.
Guoxian ZHAO, Jing HUANG, Yan XUE. Corrosion Behavior of Materials Used for Surface Gathering and Transportation Pipeline in an Oilfield. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 557-562.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.230 或 https://www.jcscp.org/CN/Y2019/V39/I6/557

表1 5种材料化学成分 (mass fraction / %)

表2 腐蚀速率测试的实验条件

图1 5种材质在0.5 MPa CO2分压条件下气相和液相环境中平均腐蚀速率随温度的变化趋势

图2 5种材质在80 ℃条件下在气相和液相环境中随CO2分压变化平均腐蚀速率变化

图3 5种材料实验后试样表面微观形貌

表3 腐蚀产物EDS分析结果

图4 5种材料实验后试样表面XRD谱

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