大庆炼化原料气外输管道腐蚀检测和评价技术研究

发布时间：2018-07-28 09:57

【摘要】：管道运输具有效率高、成本低等优点,在油气输送方面发挥着越来越重要的作用。但是随着运行年限增长、环境变化和腐蚀等原因,管道易发生腐蚀穿孔等失效情况,导致油气泄露,给生命财产和自然环境带来巨大的影响。大庆炼化原料气外输管道运行多年,腐蚀情况比较严重。因此,分析研究该管道的腐蚀状况,并对其安全状况进行评价,进而给出合理的整改方案,对于保证管道的安全运行具有重要意义。论文主要研究工作包括以下几个方面:首先,对大庆炼化原料气外输管道土壤腐蚀成分和土壤电阻率进行检测分析,在此基础上对土壤腐蚀性进行了综合评价。检测结果表明,该管线沿线土壤腐蚀性较强。其次,采用DCVG/CIPS对大庆炼化原料气外输管道外防腐层腐蚀状况和阴极保护效果进行了检测分析,结果表明该管道外防腐层腐蚀状态较为严重,阴极保护效果欠佳,需要进行整改。最后,建立了管道缺陷Von Mises应力有限元分析计算模型,并研究了均匀腐蚀情况下缺陷长度、宽度和深度,局部腐蚀情况下孔径和深度对Von Mises应力的影响规律。在此基础上,对该管道缺陷的Von Mises应力进行了分析。结果表明,大庆炼化原料气外输管道存在金属损失缺陷(ML)共计3052处,在需要立即修复的406处腐蚀缺陷中有97处缺陷的Von Mises应力超过了屈服强度。
[Abstract]:Pipeline transportation plays a more and more important role in oil and gas transportation because of its high efficiency and low cost. However, with the increase of service life, environmental change and corrosion, the pipeline is prone to corrosion and perforation, which leads to oil and gas leakage, and has a great impact on life, property and natural environment. Daqing crude gas pipeline running for many years, corrosion is serious. Therefore, it is of great significance to analyze and study the corrosion status of the pipeline, evaluate its safety condition, and then give a reasonable rectification plan for ensuring the safe operation of the pipeline. The main research work includes the following aspects: firstly, the soil corrosion composition and soil resistivity of Daqing crude gas pipeline were detected and analyzed, and the soil corrosion was evaluated synthetically. The results show that the soil along the pipeline is corrosive. Secondly, the corrosion status and cathodic protection effect of the external anticorrosive coating of Daqing crude gas pipeline are tested and analyzed by DCVG/CIPS. The results show that the corrosion state of the external anticorrosive coating is serious and the cathodic protection effect is poor, so it is necessary to carry out rectification. Finally, the finite element analysis model of Von Mises stress of pipeline defects is established, and the influence of defect length, width and depth on Von Mises stress under uniform corrosion, and pore diameter and depth under local corrosion is studied. On this basis, the Von Mises stress of the pipeline defect is analyzed. The results show that there are 3052 metal loss defects (ML) in Daqing crude gas pipeline, and 97 of the 3052 corrosion defects need to be repaired immediately. The Von Mises stress of 97 defects exceeds the yield strength.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE988.2

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