油田地面油水混输管线腐蚀影响因素分析  

Corrosion Factor Analysis of Oil-water Mixed Transportation Pipelines in Oilfield Ground

作　　者：吕乃欣 刘开平[1] 高燕[4] 郭刚 庞永莉 LU Naixin;LIU Kaiping;GAO Yan;GUO Gang;PANG Yongli(School of Material Science and Engineering,Chang＇ an University,Xi＇ an,Shnanxi 710064,P R of China;CNPC Tubular Goods Research Institute,Xi＇ an,Shaanxi 710077,P R of China;State Luboratory for Peorormance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,Xi＂ an,Shaanxi 710077,P R of China;Changqing Downhole Technology Operating Company,Chuanqing Drilling Engineering Limited Company,Xi＇an,Shaanxi 710021,P R of China;Xi＇an Changqing Technology Engineering Company,Ltd,Xi＇an,Shaanxi 710021,P R of China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]中国石油集团石油管工程技术研究院,陕西西安710077 [3]石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077 [4]川庆钻探工程有限公司长庆井下技术作业公司,陕西西安710021 [5]西安长庆科技工程有限责任公司,陕西西安710021

出　　处：《油田化学》2018年第2期350-355,共6页Oilfield Chemistry

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, pH 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 ram/a）. When the dosage or 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 was 0.523 and the probability （P） was 0.003. The pH value and salinity of sewage had a little influence on the corrosion of carbon steel. The correlation index between pH 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.

关 键 词：油水混输管线 腐蚀速率 采出污水 统计分析 相关性 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]