输油管道腐蚀因素分析与评价

Analysis and Evaluation of Corrosion Factors in Oil Pipelines

针对输油管道普遍存在的腐蚀问题,选择某油厂作为研究对象,测试其地层水中各种离子含量和总矿化度,以及其它腐蚀因素。通过静态挂片实验,用失重法测试温度、含水率、矿化度、氯离子浓度、pH值、溶解氧以及硫酸盐还原菌对腐蚀速率的影响关系。结果表明,高矿化度、高氯离子含量、酸性环境是管道腐蚀的最直接因素;含水率越高腐蚀越严重;硫酸盐还原菌的存在会对管道产生严重的腐蚀。动态高压实验表明,真实的输油管道腐蚀速率要比静态测试的结果高得多,大约是它的3-5倍。油田现场的腐蚀是在各种腐蚀因素的综合作用下产生的,各种因素相互影响,相互促进,要比单一因素的破坏严重得多。

In view of the common corrosion problems in oil pipelines,an oil production plant was selected as the research object to test various ion content and total salinity in formation water and other corrosion factors.Through static hanging experiment,the test of effects of temperature,water content,salinity,chloride ion concentration,pH value,dissolved oxygen and sulfate reducing bacteria on corrosion rate were conducted by weight loss method.The results show that high salinity,high chloride ion content and acidic environment are the most direct factors of pipeline corrosion;the higher the water content,the more serious the corrosion;the presence of sulfate-reducing bacteria will cause serious corrosion to the pipeline.Dynamic high-pressure experiments show that the actual oil pipeline corrosion rate is much higher than the static test results,about 3-5 times.The corrosion of the oilfield site is generated by the combination of various corrosion factors.The various factors influence each other and promote each other,which is much heavier than the single factor.