工程科学学报，第40卷，第5期：594-604,2018年5月 Chinese Joural of Engineering,Vol.40,No.5:594-604,May 2018 D0L:10.13374/j.issn2095-9389.2018.05.010;htp:/journals.usth.edu.cm 集输管道C0,/油/水环境中X65钢的腐蚀特征 程远鹏2)，白羽)，李自力)四，刘建国) 1)长江大学石油工程学院，武汉4301002)中国石油大学（华东）储运与建筑工程学院，青岛266580 ☒通信作者，E-mail:lizili@pc.ed.cm 摘要通过高温高压动态反应釜实验模拟油田集输管道腐蚀环境，采用腐蚀失重、X射线衍射、扫描电镜和电化学分析等方 法，研究了C02/油/水环境中X65钢的腐蚀行为.结果表明：不同原油含水率条件下，X65钢C02腐蚀形态发生改变.含水率 较低(40%~50%)时，原油的浸润作用使X65钢表面发生均匀腐蚀，局部由于原油吸附不均匀出现点蚀特征：含水率在70% -~80%之间时，原油对钢表面屏障作用减弱，生成的产物膜厚而疏松、局部脱落引发台地腐蚀：含水率为90%时，台地腐蚀破 坏区域扩大，腐蚀加重.原油可以明显改变腐蚀产物晶体颗粒大小、堆垛方式、产物膜结构以及化学成分.在原油的缓蚀作用 下，X65钢C02腐蚀过程的温度敏感点向低温段移动，出现在50℃左右，腐蚀速率降低区间变宽，X65钢耐蚀性增强. 关键词X65钢：集输管道；C02腐蚀：原油：腐蚀产物膜 分类号TG174.2 Corrosion characteristics of X65 steel in CO,/oil/water environment of gathering pipeline CHENG Yuan-peng'2),BAI Yu),LI Zi-2),LIU Jian-guo?) 1)College of Petroleum Engineering,Yangtze University,Wuhan 430100,China 2)College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266580.China Corresponding author,E-mail:lizili@upc.edu.cn ABSTRACT The corrosion behavior of X65 steel in the CO,/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 low- er 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 dis- solved in a corrosive medium and change the dimension and accumulation pattern of the crystal grain,thickness and structure of corro- sion 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-50C,lower corrosion rate interval is broadened,and the corrosion resistance of X65 steel is enhanced. KEY WORDS X65 steel;gathering pipeline;CO corrosion;crude oil;corrosion scales 在油气田的集输管道中普遍存在着C0,腐蚀， 国内外研究表明，在油气田集输系统的腐蚀失效中， 收稿日期：2017-08-08 基金项目：国家自然科学基金资助项目(51301201)工程科学学报,第 40 卷,第 5 期:594鄄鄄604,2018 年 5 月 Chinese Journal of Engineering, Vol. 40, No. 5: 594鄄鄄604, May 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 05. 010; http: / / journals. ustb. edu. cn 集输管道 CO2 / 油 / 水环境中 X65 钢的腐蚀特征 程远鹏1,2) , 白 羽1) , 李自力2) 苣 , 刘建国2) 1) 长江大学石油工程学院, 武汉 430100 2) 中国石油大学(华东)储运与建筑工程学院, 青岛 266580 苣 通信作者,E鄄mail: lizili@ upc. edu. cn 摘 要 通过高温高压动态反应釜实验模拟油田集输管道腐蚀环境,采用腐蚀失重、X 射线衍射、扫描电镜和电化学分析等方 法,研究了 CO2 / 油/ 水环境中 X65 钢的腐蚀行为. 结果表明:不同原油含水率条件下,X65 钢 CO2 腐蚀形态发生改变. 含水率 较低(40% ~ 50% )时,原油的浸润作用使 X65 钢表面发生均匀腐蚀,局部由于原油吸附不均匀出现点蚀特征;含水率在 70% ~ 80% 之间时,原油对钢表面屏障作用减弱,生成的产物膜厚而疏松、局部脱落引发台地腐蚀;含水率为 90% 时,台地腐蚀破 坏区域扩大,腐蚀加重. 原油可以明显改变腐蚀产物晶体颗粒大小、堆垛方式、产物膜结构以及化学成分. 在原油的缓蚀作用 下,X65 钢 CO2 腐蚀过程的温度敏感点向低温段移动,出现在 50 益左右,腐蚀速率降低区间变宽,X65 钢耐蚀性增强. 关键词 X65 钢; 集输管道; CO2 腐蚀; 原油; 腐蚀产物膜 分类号 TG 174郾 2 收稿日期: 2017鄄鄄08鄄鄄08 基金项目: 国家自然科学基金资助项目(51301201) Corrosion characteristics of X65 steel in CO2 / oil / water environment of gathering pipeline CHENG Yuan鄄peng 1,2) , BAI Yu 1) , LI Zi鄄li 2) 苣 , LIU Jian鄄guo 2) 1) College of Petroleum Engineering, Yangtze University, Wuhan 430100, China 2) College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China 苣 Corresponding author, E鄄mail: lizili@ upc. edu. cn ABSTRACT The corrosion behavior of X65 steel in the CO2 / oil / water environment of gathering pipeline was investigated by mass loss, X鄄ray powder diffraction (XRD), scanning electron microscopy with X鄄ray microanalysis ( SEM鄄鄄 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% 鄄鄄50% , uniform corrosion occurs along with a low鄄 er 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% 鄄鄄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 dis鄄 solved in a corrosive medium and change the dimension and accumulation pattern of the crystal grain, thickness and structure of corro鄄 sion scales, thus influencing the corrosion rate. Under the corrosion inhibition effect of crude oil, the temperature鄄sensitive point of X65 steel corrosion moves to a low temperature at - 50 益 , lower corrosion rate interval is broadened, and the corrosion resistance of X65 steel is enhanced. KEY WORDS X65 steel; gathering pipeline; CO2 corrosion; crude oil; corrosion scales 在油气田的集输管道中普遍存在着 CO2 腐蚀, 国内外研究表明,在油气田集输系统的腐蚀失效中