油气水三相混输海底管道腐蚀机理研究及防护对策

Study on Corrosion Mechanism and Protection Measures of Oil Gas Water Three Phase Mixed Transportation Submarine Pipeline

随着南海某油田开采年限的延长,油田产液及综合含水率逐年上升、油井产液中二氧化碳、硫化氢气体含量升高等因素引发各种海管腐蚀问题发生,为制定有效海管防腐策略,油田通过海管智能球内检测、取防腐挂片、海管垢样分析数据及腐蚀理论对油气水混输海底管道内腐蚀机理及影响因素进行深入分析,得出海管内腐蚀主要由二氧化碳腐蚀为主,并伴有流体冲刷腐蚀为辅的腐蚀机理。通过进行有效的海管防腐措施,成功地将海管腐蚀速率控制在较低水平。

With the development of an oil field in the South China Sea,the production fluid and comprehensive water cut of the oil field are increasing year by year,and the content of carbon dioxide and hydrogen sulfide in the production fluid of the oil well is increasing,which leads to a variety of submarine pipeline corrosion problems.In order to develop an effective anti-corrosion strategy for submarine pipeline,the oilfield has carried out the research on the corrosion of oil gas water mixed transportation pipeline through intelligent detection of submarine pipeline,anti-corrosion test piece,analysis data of submarine pipeline scale sample and corrosion theory.Through in-depth analysis of the corrosion mechanism and influencing factors of the submarine pipeline,it is concluded that the corrosion mechanism of the submarine pipeline is mainly caused by carbon dioxide corrosion,supplemented by fluid erosion corrosion.Through effective anticorrosion measures,the corrosion rate of submarine pipeline is successfully controlled at a low level.