环境因素对BT80S-5Cr抗CO<sub>2</sub>/H<sub>2</sub>S腐蚀套管均匀腐蚀速率的影响

石晓霞; 雷鸣; 詹飞; 强强; 张程远

doi:10.19938/j.steelpipe.1001-2311.2024.5.15.19

环境因素对BT80S-5Cr抗CO₂/H₂S腐蚀套管均匀腐蚀速率的影响

内蒙古包钢钢联股份有限公司, 内蒙古包头 014010

详细信息

作者简介:
石晓霞(1984-),女,博士,正高级工程师,主要从事油井管品种开发工作。

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出版历程
- 收稿日期: 2024-03-14

Effect of Environmental Factors on Uniform Corrosion Rate of BT80S-5Cr Anti-CO₂/H₂S Corrosion Casing

Inner Mongolia Baogang Steel Union Co., Ltd., Baotou 014010, China

摘要

摘要: 通过模拟国内某油田腐蚀工况，采用高温高压釜模拟腐蚀试验，利用失重法研究试验周期、温度、CO₂及H₂S分压环境因素对BT80S-5Cr油套管均匀腐蚀速率的影响。研究表明，随着试验周期的延长，试验钢均匀腐蚀速率逐渐降低，且降幅趋于平缓，试验周期360 h是BT80S-5Cr在该油气田模拟工况下衡量耐蚀性能的最佳试验周期；随着试验温度的提高，试验钢均匀腐蚀速率逐渐增加，试验温度100℃的试验钢的均匀腐蚀速率是试验温度40℃时的均匀腐蚀速率的1.67倍；随着CO₂分压的提高，试验钢均匀腐蚀速率逐渐增加，CO₂分压1.0 MPa的试验钢均匀腐蚀速率是不含CO₂时的均匀腐蚀速率的10倍；随着H₂S分压的提高，试验钢均匀腐蚀速率逐渐降低，微量H₂S气体的引入对试验钢电化学腐蚀行为有一定的抑制作用。
- 套管 /
- BT80S-5Cr /
- 腐蚀速率 /
- CO₂/H₂S
Abstract: For simulation the corrosive working conditions of a certain domestic oil field，the corrosion test is conducted with the high temperature/high pressure caldron and the weight loss method to investigate the effects of relevant environmental factors on the uniform corrosion rate of the BT80S-5Cr oil casing，including the test cycle，the temperature and the CO₂ and H₂S partial pressures. The results show that along with the extension of the test period，the uniform corrosion rate of the test steel gradually decreases，and the decrease tends to be steady and slow；and the test period of 360 h is the best test period for the BT80S-5Cr steel to measure the corrosion resistance under the simulated working conditions of the said oil/gas field；with the increase of test temperature，the uniform corrosion rate of the test steel gradually increases；the uniform corrosion rate of the test steel as tested at 100 ℃ is 1.67 times that of the test steel as tested at 40 ℃；With the increase of the CO₂ partial pressure，the uniform corrosion rate of the test steel gradually increases，and the uniform corrosion rate of the test steel with a partial pressure of CO₂ of 1.0 MPa is 10 times that of the test steel free of CO₂；along with the increase of the H₂S partial pressure，the uniform corrosion rate of the test steel gradually decreases，and the introduction of trace H₂S gas has a certain inhibitory effect on the electrochemical corrosion behavior of the test steel.
- casing /
- BT80S-5Cr /
- corrosion rate /
- CO₂/H₂S

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