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海底管道理化性能及腐蚀失效分析
Analysis of physicochemical properties and corrosion failure of submarine pipelines
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- DOI:
- 10.3969/j.issn.1001-2206.2025.S.022
- 作者:
- 杨冬平, 宋昊昕, 石双, 吴佳, 王伟斌, 李民强
YANG Dongping, SONG Haoxin, SHI Shuang, WU Jia, WANG Weibin, LI Minqiang
- 作者单位:
- 1. 中国石化胜利油田技术检测中心, 山东东营 257000;2. 中国石化(山东)检测评价研究有限公司, 山东东营 257000;3. 中国石油大学(华东)机电工程学院, 山东青岛 256555;4. 中国石化胜利油田海洋采油厂, 山东东营 257237
1. Sinopec Shengli Oilfield Technical Testing Center, Dongying 257000, China;2. Sinopec (Shandong) Testing & Evaluation Research Co., Ltd., Dongying 257000, China;3. College of Mechanical and Electrical Engineering, China University of Petroleum (East China), Qingdao 256555, China;4. Offshore Oil Production Plant, Sinopec Shengli Oilfield, Dongying 257237, China
- 关键词:
- 海底管道; 理化性能分析; 吸氧腐蚀; CO2腐蚀; 垢下腐蚀
submarine pipeline;physicochemical property analysis;oxygen absorption corrosion;CO2 corrosion;under-deposit corrosion
- 摘要:
为系统探究现役海底管道的腐蚀状况，选取某海域16条服役15 a的海底管道进行拆解分析，其中输油管道和注水管道各8条。对上述管道内外壁的腐蚀情况、理化性能和腐蚀产物开展系统检测分析。通过宏观腐蚀形貌分析，明确管道腐蚀类型；在理化性能检测方面，对管道材料的化学成分、金相组织、力学性能及蚀坑深度进行测试，并与相关规范进行对比；为了判断管材腐蚀趋势，基于蚀坑深度数据，计算了管道腐蚀速率；针对腐蚀产物，综合利用能谱分析（EDS）与X射线衍射技术，对腐蚀产物进行定性定量研究，明确了腐蚀失效过程和原因。研究表明，该海域服役15 a的海底管道管材力学性能符合规范要求，管道内外壁均呈现均匀腐蚀特征，注水管道的腐蚀程度相对严重；管道外壁腐蚀主要为吸氧腐蚀，输油管道内壁以CO2腐蚀为主，而注水管道内壁则以垢下腐蚀为主，同时伴有少量CO2腐蚀及硫酸盐还原菌腐蚀现象。研究成果可为后续海底管道腐蚀强度评估提供必要的数据支撑。
To systematically investigate the corrosion condition of in-service submarine pipelines, 16 submarine pipelines that have been in service for 15 years in a certain sea area were selected for disassembly and analysis, including 8 oil pipelines and 8 water injection pipelines. Systematic detection and analysis were conducted on the corrosion conditions, physicochemical properties, and corrosion products of the inner and outer walls of the above pipelines. Through macro-corrosion morphology analysis, the types of pipeline corrosion were identified. In terms of physicochemical property testing, the chemical composition, metallographic structure, mechanical properties, and pit depth of the pipeline materials were tested and compared with relevant specifications. To determine the corrosion trend of the pipe materials, the pipeline corrosion rate was calculated based on the pit depth data. For corrosion products, qualitative and quantitative studies were carried out using energy dispersive spectroscopy (EDS) and X-ray diffraction technology to clarify the corrosion failure process and causes. The research shows that the mechanical properties of the 15-year-old submarine pipeline materials in this sea area meet the specification requirements. Both the inner and outer walls of the pipelines exhibit uniform corrosion characteristics, with the corrosion degree higher in water injection pipelines. The corrosion on the outer wall of the pipelines is mainly oxygen absorption corrosion, while the inner wall of oil pipelines is dominated by CO2 corrosion. The inner wall of water injection pipelines is mainly under-deposit corrosion, accompanied by a small amount of CO2 corrosion and sulfate-reducing bacteria corrosion. The research results can provide necessary data support for subsequent corrosion strength evaluation of submarine pipelines.