林海,许杰,幸雪松,范白涛,杨进,王晓鹏.L80 油管钢在 CO2/H2S 环境中的腐蚀行为[J].表面技术,2016,45(5):84-90.
LIN Hai,XU Jie,XING Xue-song,FAN Bai-tao,YANG Jin,WANG Xiao-peng.Corrosion Behavior of L80 Tubing Steel in CO2/H2S Environment[J].Surface Technology,2016,45(5):84-90
L80 油管钢在 CO2/H2S 环境中的腐蚀行为
Corrosion Behavior of L80 Tubing Steel in CO2/H2S Environment
投稿时间:2016-01-19  修订日期:2016-05-20
DOI:10.16490/j.cnki.issn.1001-3660.2016.05.013
中文关键词:  L80 油管钢  CO2/H2S 腐蚀  腐蚀产物  腐蚀速率  腐蚀形貌  影响因素
英文关键词:L80 tubing steel  CO2/H2S corrosion  corrosion product  corrosion rate  corrosion morphology  influencing factors
基金项目:总公司科技重大专项(YXKY-2013-TJ-01);总公司科技重大专项(YXKY-2015-TJ-04)
作者单位
林海 中海石油有限公司天津分公司,天津 300452 
许杰 中海石油有限公司天津分公司,天津 300452 
幸雪松 中海石油有限公司天津分公司,天津 300452 
范白涛 中海石油有限公司天津分公司,天津 300452 
杨进 中国石油大学 石油工程学院,北京 102249 
王晓鹏 中海石油有限公司天津分公司,天津 300452 
AuthorInstitution
LIN Hai CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
XU Jie CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
XING Xue-song CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
FAN Bai-tao CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
YANG Jin Department of Petroleum Engineering, China University of Petroleum, Beijing 102249, China 
WANG Xiao-peng CNOOC China Limited, Tianjin Branch, Tianjin 300452, China 
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中文摘要:
      目的 研究 L80 油管在 CO2/H2S 环境中的腐蚀行为。 方法 利用扫描电镜(SEM)、 EDAX 能谱分析 L80 油管内壁腐蚀产物形貌特征和化学组成,采用高温高压反应釜,以实际油水分离的水样为腐蚀介质进行模拟实验,研究原油含水率、 CO2/H2S 分压和温度对 L80 油管腐蚀速率的影响规律。结果 在 CO2/H2S 环境中, L80 油管内壁呈现明显的局部腐蚀特征,部分表面点蚀坑深度超过 100 μm,形成 FeS、 FeCO3 等腐蚀产物。随着含水率的增加, L80 油管腐蚀速率逐渐增大,含水率为 30%时的腐蚀速率为 0.0377 mm/a,含水率为 100%时的腐蚀速率为 0.0952 mm/a。 CO2 分压不变时,随着 H2S 分压的增加, L80 钢的腐蚀速率增大, H2S 分压为 0.04 MPa 时的腐蚀速率为 0.0377 mm/a, H2S 分压为 0.3MPa 时的腐蚀速率为 0.0952 mm/a; H2S 分压不变时,随着 CO2 分压的增大, L80 钢腐蚀速率变化不明显且腐蚀速率较小。随着温度的升高,腐蚀速率先以较大幅度增大,再以较小幅度减小,从 40 ℃增加至 100 ℃时,腐蚀速率由 0.0083 mm/a 升至 0.1264 mm/a, 100 ℃左右时的腐蚀速率最大, 120 ℃对应的腐蚀速率为 0.106 mm/a。 结论 L80 油管在 CO2/H2S 环境中以均匀腐蚀和局部点蚀为主。 L80 油管腐蚀速率对 H2S 分压比 CO2分压更敏感, CO2分压增大促使具有良好保护性的 FeCO3保护膜的形成,降低了腐蚀速率。温度升高至一定范围,导致碳酸盐等难溶性盐溶解度降低,并覆盖在钢表面形成保护层,从而使腐蚀速率下降。
英文摘要:
      Objective To study the corrosion behavior of L80 tubing in CO2/H2S environment. Methods Scanning electron microscopy (SEM) and EDAX energy spectrum were used to analyze appearance characteristics and chemical compositions of corrosion products, and simulation experiment was conducted using HTHP autoclave and actual water sample after oil/water separation as the corrosive medium, to study the influence law of water cut, CO2/H2S partial pressure and temperature on L80 tubing corrosion rate. Results In CO2/H2S environment, L80 tubing inwall had obvious local corrosion characteristics, the depth of pitting corrosion in part area was more than 100 μm, and corrosion products such as FeS,FeCO3 were formed. With the increase of water cut, the corrosion rate of L80 tubing gradually increased, the corrosion rate was 0.0377 mm/a when water cut was 30%, the corrosion rate was 0.0952 mm/a when water cut was 100%. When the CO2 partial pressure was constant, with the increase of H2S partial pressure, L80 steel corrosion rate increased; the corrosion rate was 0.0377 mm/a when H2S partial pressure was 0.04 MPa; the corrosion rate was 0.0952 mm/a when H2S partial pressure was 0.3 MPa. When the H2S partial pressure was constant, with increasing CO2 partial pressure, the corrosion rate of L80 steel did not significantly change, and the corrosion rate was smaller. With increasing temperature, the corrosion rate firstly significantly increased, and then decreased with a smaller amplitude. The corrosion rate changed from 0.0083 mm/a to 0.1264 mm/a when the temperature increased from 40 ℃ to 100 ℃, and the corrosion rate was the largest at about 100 ℃. The corrosion rate was 0.106 mm/a when the temperature was 120 ℃. Conclusion L80 tubing had mainly uniform and local corrosion in CO2/H2S environment. The corrosion rate of L80 tubing was more sensitive to H2S partial pressure than CO2 partial pressure. Good FeCO3 protective film was formed when CO2 partial pressure increased, reducing the corrosion rate. When the temperature increased to a certain range, the solubility of carbonate and other slightly soluble salts was reduced, forming a protective layer on steel surface to decrease the corrosion rate.
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