天然气工业2017，Vol.37Issue(6)：86-92,7.DOI:10.3787/j.issn.1000-0976.2017.06.012
气田产出水介质中特殊黄铜合金对N80钢腐蚀性的影响
Corrosion inhibition effect of special brass alloy on N80 steel pipes in gas-field produced water
摘要
Abstract
With the continuous development of a gas field,composite water cut increases consistently and the salinity of produced water increases significantly.Meanwhile,a large number of corrosive substances are produced,such as CO2,H2S and C1-,and they might lead to failures of tubing and casing,threatening the operation safety.In this paper,the corrosion inhibition effect of special brass alloy on a N80 steel pipe in gas-field produced water was analyzed by means of an electrochemical testing system,scanning electrochemical microscopy,scanning electron microscopy and other techniques to develop a new alloy material which can prevent and alleviate gas pipe corrosion.Then,the corrosion inhibition effect of special brass on the N80 steel pipe under different heat treatment conditions was investigated.It is indicated that,when the gas-field produced water is treated with special brass alloy,the self-corrosion potential of the N80 steel pipe increases from-0.82 V to-0.59 V and the self-corrosion current drops to 2.78× 10-6 A/cm2.Moreover,after the pipe is corroded by the produced water which is treated with special brass alloy in the state of solution and aging,its Ret is higher,indicating its better corrosion inhibition on the N80 steel pipe.Besides,if the N80 steel pipe is corroded by the produced water without special brass alloy,the current of hydrogen evolution at its surface is higher and the activity zones are relatively concentrated.If the N80 steel pipe is corroded by the produced water which is treated with special brass alloy in the state of solution and aging,its surface is less corroded and there are fewer activity zones and corrosion products.It is revealed that by virtue of special brass alloy,the corrosion to N80 steel pipes is effectively alleviated.The research result provides the evidence that alloy materials can be used to prevent or alleviate steel pipe corrosion effectively.关键词
特殊黄铜合金/固溶时效/气田产出水/N80钢/极化曲线/阻抗谱/面扫描图/腐蚀形貌Key words
Special brass alloy/Solution and aging/Gas field produced water/N80 steel/Polarization curve/Impedance spectrum/Surface scanning graph/Corrosion morphology引用本文复制引用
范舟,王子瑜,刘建仪,黄泰愚,钟平勇..气田产出水介质中特殊黄铜合金对N80钢腐蚀性的影响[J].天然气工业,2017,37(6):86-92,7.基金项目
“油气藏地质及开发工程”国家重点实验室·西南石油大学开放基金资助项目“高含硫酸性气藏元素硫沉积腐蚀的微观特征研究”(编号:PLN1516)、西南石油大学大学生课外开放性实验重点项目“油田水介质中特殊黄铜合金对N80钢腐蚀性的影响研究”(编号:KSZ16122). （编号:PLN1516）
