油田地面油水混输管线腐蚀影响因素分析
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摘要
为获得油田采出污水与管材材质对油田地面油水混输管线腐蚀行为的影响规律,通过测定按不同标准生产的碳钢和不锈钢在33个区块采出污水中的腐蚀速率,结合统计分析软件SPSS的分析结果,研究了污水中S~(2-)含量、p H值、矿化度以及管材材质等因素与钢材腐蚀速率之间的相关性。结果表明,碳钢类材质化学成分含量相近,碳钢类材质之间腐蚀速率的相关系数均大于0.945,呈显著正相关关系,几种碳钢类材质在油田污水中的耐蚀性差异较小;不锈钢类材质含有Cr、Ni等合金元素,耐蚀性能大大增强。油田污水中S~(2-)含量对碳钢类材质的腐蚀影响较大,随污水中S~(2-)浓度增加,碳钢类材质的腐蚀速率先增加后降低,S~(2-)为68 mg/L时碳钢达到最大腐蚀速率0.1823 mm/a;污水中S~(2-)含量小于70 mg/L时,S~(2-)与碳钢类材质腐蚀速率呈现显著正相关,相关系数0.523,概率(P)为0.003。采出污水p H值和矿化度对碳钢腐蚀的影响较小,污水p H值和矿化度与碳钢腐蚀速率的相关系数分别为0.238、0.130,P分别为0.182、0.468,存在相关性但影响有限。
In order to study the effect of oilfield produced water and pipeline material on the corrosion of oil-water mixed transportation pipelines in oilfield ground,the correlation between S~(2-)content,p H value and salinity of sewage,pipeline material and the corrosion rate of steel was analyzed by measuring the corrosion rate of carbon steel produced by different standards and stainless steel in produced water of 33 blocks,and combining with the statistical analysis software SPSS. The results showed that the chemical composition of carbon steels was similar. The correlation coefficient of corrosion rates between carbon steel materials was greater than 0.945,showing a significant positive correlation. The corrosion resistance differences of several kinds of carbon steel in oilfield produced water were small. Because of the alloy elements Cr and Ni,the corrosion resistance of stainless steel material was greatly enhanced. The content of S~(2-)in oilfield produced water had a great influence on the corrosion of carbon steel. With the increase of S~(2-)concentration in oilfield produced water,the corrosion rate of carbon steel increased first and then decreased. When the dosage of S~(2-)was 68 mg/L,the carbon steel had the maximum corrosion rate(0.1823 mm/a). When the dosage of S~(2-)in sewage was less than 70 mg/L,S~(2-)had a significant positive correlation with corrosion rate of carbon steel which correlation coefficient was0.523 and the probability(P)was 0.003. The p H value and salinity of sewage had a little influence on the corrosion of carbon steel.The correlation index between p H value and salinity of sewage and corrosion rate of carbon steel was 0.238 and 0.130,and the probability(P)was 0.182 and 0.468 respectively,showing a limited correlation to corrosion.
In order to study the effect of oilfield produced water and pipeline material on the corrosion of oil-water mixed transportation pipelines in oilfield ground,the correlation between S~(2-)content,p H value and salinity of sewage,pipeline material and the corrosion rate of steel was analyzed by measuring the corrosion rate of carbon steel produced by different standards and stainless steel in produced water of 33 blocks,and combining with the statistical analysis software SPSS. The results showed that the chemical composition of carbon steels was similar. The correlation coefficient of corrosion rates between carbon steel materials was greater than 0.945,showing a significant positive correlation. The corrosion resistance differences of several kinds of carbon steel in oilfield produced water were small. Because of the alloy elements Cr and Ni,the corrosion resistance of stainless steel material was greatly enhanced. The content of S~(2-)in oilfield produced water had a great influence on the corrosion of carbon steel. With the increase of S~(2-)concentration in oilfield produced water,the corrosion rate of carbon steel increased first and then decreased. When the dosage of S~(2-)was 68 mg/L,the carbon steel had the maximum corrosion rate(0.1823 mm/a). When the dosage of S~(2-)in sewage was less than 70 mg/L,S~(2-)had a significant positive correlation with corrosion rate of carbon steel which correlation coefficient was0.523 and the probability(P)was 0.003. The p H value and salinity of sewage had a little influence on the corrosion of carbon steel.The correlation index between p H value and salinity of sewage and corrosion rate of carbon steel was 0.238 and 0.130,and the probability(P)was 0.182 and 0.468 respectively,showing a limited correlation to corrosion.
引文
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[2]李占坤,孙彪,王喜乐,等.塔河油田油气集输管网腐蚀现状及防腐蚀技术[J].腐蚀与防护,2015,36(3):240-244.
[3]方绍燕.油田注水系统腐蚀因素的分析[J].油田化学,2015,32(2):277-281.
[4]李文宏,高春宁,向忠远,等.长庆高矿化度含油污水生化处理新技术研究及应用[J].油田化学,2011,28(4):457-462.
[5]宋绍富,刘菊荣.延长油田长2与长6地层采出水混合结垢规律研究[J].油田化学,2010,27(4):446-448.
[6]杨欢,罗跃,苑慧莹,等.油田集输管道内流动流体结垢动力学研究[J].油田化学,2016,33(2):351-356.
[7]王倩,马云,屈撑囤,等.油气田水系统钢材腐蚀的电化学研究进展[J].油田化学,2013,30(3):471-476.
[8]温建萍,李博明,温涛,等.油田回注污水对常用管线钢的腐蚀性[J].腐蚀科学与防护技术,2006,18(1):28-31.
[9]DEMOZ A,PAPAVINASAM S,OMOTOSO O,et al.Effect of field operational variables on internal pitting corrosion of oil and gas pipelines[J].Corrosion,2009,65(11):741-747.
[10]郭志刚.社会统计方法:SPSS软件应用[M].北京:中国人民大学出版社,1999:12-15.
[11]曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2008:187-192.
[12]郭霖,徐秀清.S2-浓度对含盐污水中10#碳钢腐蚀性能的影响[J].科技导报,2014,32(24):31-34.
[13]冯拉俊,马小菊,雷阿利.硫离子对碳钢腐蚀性的影响[J].腐蚀科学与防护技术,2006,18(3):180-182.
[14]李洪建,王闰,杜清珍,等.NR油田油井井筒腐蚀影响因素实验研究[J].西南石油大学学报(自然科学版),2016,38(1):146-151.
[15]刘长坤,李春福,赵海杰,等.高矿化度油气田盐卤水对碳钢的腐蚀行为研究[J].西南石油大学学报(自然科学版),2010,32(2):154-158.
[16]高立群.碳钢在油气田水介质腐蚀行为及防护措施研究[D].沈阳:中国科学院金属研究所,2008:65-68.
[17]陈学群,常万顺,陈德斌.碳钢中夹杂物诱发点蚀的规律和特性研究[J].海军工程大学学报,2004,16(6):30-36.