吴起—延炼输油管道阴极保护系统运行现状分析及优化运行研究

发布时间：2019-06-14 06:49

【摘要】：随着石油的广泛应用,石油运输在石油行业起着至关重要的作用。相比于槽车、船舶运输,管道输送成本低,效率高,建设周期短,占地少,安全无污染,已经成为世界各个油气等流体的主要输送方式之一。腐蚀是造成长输原油管道失效的重要因素之一,阴极保护方法是埋地管道防腐蚀的有效方法。本文通过研究吴起-延炼输油管道阴极保护系统,综述了阴极保护系统的原理及3种阴极保护方法,即牺牲阳极阴极保护法、外加电流阴极保护法及排流保护法,并概述了国内外目前在阴极保护方法领域研究的现状,说明了阴极保护方法在实际应用中复杂多样性。因此本文通过对长为402.55公里的吴起-延炼输油管道阴极保护系统进行检测,结果显示共有240个测试桩的电位在保护电位内；应用RD-PCM电流测绘系统对防腐层漏电检测进行检测,结果显示共有漏电处285处：通过对管道地面装置及管道位置走向检测,结果显示部分测试桩存在外露、无警告牌等现象；对电流测试及土壤腐蚀性测定,监测8小时结果显示电流曲线平稳,并未发现杂散电流干扰迹象；对管道开挖选择了三个点进行开挖检测研究,分别是1#、4#、9#坑,开挖后进行数据实测,数据结果评定合格。通过对上述吴起-延炼输油管道阴极保护系统的检测研究,对检测问题进行分析及给出整改意见,优化了该阴极保护系统,保证了该阴极保护系统的的正常有效的运行。
[Abstract]:With the wide application of oil, oil transportation plays an important role in the oil industry. Compared with tank car and ship transportation, pipeline transportation has become one of the main transportation modes of oil and gas in the world because of its low cost, high efficiency, short construction cycle, less occupation of land, safety and no pollution. Corrosion is one of the important factors causing the failure of long-distance crude oil pipeline, and cathodic protection method is an effective method to prevent corrosion of buried pipeline. In this paper, the principle of cathodic protection system and three kinds of cathodic protection methods, namely, sacrifice anode cathodic protection, applied current cathodic protection and discharge protection, are reviewed by studying the cathodic protection system of Wuqi-Yanling oil pipeline, and the present research situation in the field of cathodic protection methods at home and abroad is summarized, and the complexity and diversity of cathodic protection methods in practical application are explained. Therefore, the cathodic protection system of Wuqi-Yanling pipeline, which is 402.55 kilometers long, is tested in this paper. the results show that the potential of 240 test piles is within the protection potential. RD-PCM current mapping system is used to detect the leakage of anticorrosion coating. The results show that there are 285 leakage places: through the detection of pipeline ground device and pipeline position, the results show that some of the test piles are exposed and there is no warning board, and for the current test and soil corrosion measurement, the monitoring results show that the current curve is stable and no sign of stray current interference is found. Three points are selected for pipeline excavation to carry on the excavation inspection research, respectively is 1, 4, 9 # pit, after excavation carries on the data measurement, the data result evaluation is qualified. Through the detection and research of the cathodic protection system of Wuqi-Yanling pipeline, the detection problem is analyzed and the rectification suggestions are given. The cathodic protection system is optimized to ensure the normal and effective operation of the cathodic protection system.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE988.2

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