集輸管道CO<sub>2</sub>/油/水環境中X65鋼的腐蝕特征

程遠鵬; 白羽; 李自力; 劉建國

doi:10.13374/j.issn2095-9389.2018.05.010

集輸管道CO₂/油/水環境中X65鋼的腐蝕特征

doi: 10.13374/j.issn2095-9389.2018.05.010

程遠鵬^1,2,
白羽¹,
李自力^2, ,,
劉建國²

1) 長江大學石油工程學院, 武漢 430100
2) 中國石油大學(華東)儲運與建筑工程學院, 青島 266580

基金項目:

國家自然科學基金資助項目(51301201)

詳細信息

中圖分類號: TG174.2
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出版歷程
- 收稿日期: 2017-08-08

Corrosion characteristics of X65 steel in CO₂/oil/water environment of gathering pipeline

1) College of Petroleum Engineering, Yangtze University, Wuhan 430100, China
2) College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China

摘要

摘要: 通過高溫高壓動態反應釜實驗模擬油田集輸管道腐蝕環境,采用腐蝕失重、X射線衍射、掃描電鏡和電化學分析等方法,研究了CO₂/油/水環境中X65鋼的腐蝕行為. 結果表明:不同原油含水率條件下,X65鋼CO₂腐蝕形態發生改變. 含水率較低(40%~50%)時,原油的浸潤作用使X65鋼表面發生均勻腐蝕,局部由于原油吸附不均勻出現點蝕特征;含水率在70%~80%之間時,原油對鋼表面屏障作用減弱,生成的產物膜厚而疏松、局部脫落引發臺地腐蝕;含水率為90%時,臺地腐蝕破壞區域擴大,腐蝕加重. 原油可以明顯改變腐蝕產物晶體顆粒大小、堆垛方式、產物膜結構以及化學成分. 在原油的緩蝕作用下,X65鋼CO₂腐蝕過程的溫度敏感點向低溫段移動,出現在50℃左右,腐蝕速率降低區間變寬,X65鋼耐蝕性增強.
- X65鋼 /
- 集輸管道 /
- CO₂腐蝕 /
- 原油 /
- 腐蝕產物膜
Abstract: The corrosion behavior of X65 steel in the CO₂/oil/water environment of gathering pipeline was investigated by mass loss, X-ray powder diffraction (XRD), scanning electron microscopy with X-ray microanalysis (SEM-EDS), and electrochemical analysis through dynamic reactor tests. The results indicate that the corrosion rate increases and the corrosion morphology changes with an increase in the water cut. When the water cut of crude oil is within the range 40%-50%, uniform corrosion occurs along with a lower corrosion rate due to the protection of crude oil, but pitting corrosion appears due to the inhomogeneous adsorption of crude oil. When the water cut is between 70%-80%, the barrier effect of crude oil on the steel surface is weakened, the corrosion scales become thick and loose, and the partial loss of corrosion scales cause mesa corrosion. When the water cut is 90%, the damage area of platform corrosion is enlarged. Consequently, the corrosion rate dramatically increases. Crude oil can hinder the corrosion scales from being dissolved in a corrosive medium and change the dimension and accumulation pattern of the crystal grain, thickness and structure of corrosion scales, thus influencing the corrosion rate. Under the corrosion inhibition effect of crude oil, the temperature-sensitive point of X65 steel corrosion moves to a low temperature at -50℃, lower corrosion rate interval is broadened, and the corrosion resistance of X65 steel is enhanced.
- X65 steel /
- gathering pipeline /
- CO₂ corrosion /
- crude oil /
- corrosion scales

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參考文獻(15)

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