气田产出水介质中特殊黄铜合金对N80钢腐蚀性的影响

发布时间：2018-08-02 14:01

【摘要】：随着气田的持续开发,气田综合含水率不断上升、产出水的矿化度显著提高,同时还伴随着大量的CO_2、H_2S、Cl~-等腐蚀性物质产生,有可能引发油管和套管失效,存在着安全风险。为了寻找新型合金材料、预防和减轻气井生产管线腐蚀,采用电化学测试系统、扫描电化学显微镜、电子扫描显微镜等测试手段,研究了在气田产出水环境中特殊黄铜合金对N80钢腐蚀性的影响,并考察了不同热处理状态下特殊黄铜减缓N80钢腐蚀的效果。结果表明:(1)气田产出水经特殊黄铜合金处理后,N80钢的自腐蚀电位由-0.82 V上升至-0.59 V,自腐蚀电流下降至2.78×10~(-6) A/cm~2;(2)经固溶时效状态特殊黄铜合金处理后的产出水腐蚀后的N80钢R_(ct)值较大,对N80钢的缓蚀作用较好;(3)未经特殊黄铜合金处理的产出水腐蚀后的N80钢表面析氢电流较大,活性区域也较为集中,而经固溶时效状态特殊黄铜合金处理的采出水溶液腐蚀后的N80钢表面腐蚀较轻,活性区域和腐蚀产物都有所减少,能够更好减缓N80钢的腐蚀。该成果为合金材料有效应用于预防或减轻管道腐蚀提供了依据。
[Abstract]:With the continuous development of the gas field, the comprehensive water cut of the gas field increases continuously, and the salinity of the produced water increases significantly. At the same time, with the production of a large number of corrosive substances such as CO2T / H2S / Cl-, it is possible to cause the failure of tubing and casing, and there is a safety risk. In order to find new alloy materials and to prevent and reduce pipeline corrosion in gas wells, electrochemical testing system, scanning electrochemical microscope, electronic scanning microscope and other testing methods are used. The effect of special brass alloy on corrosion of N80 steel in producing water environment of gas field was studied, and the effect of special brass on corrosion mitigation of N80 steel under different heat treatment conditions was investigated. The results show that: (1) the corrosion potential of N80 steel increases from -0.82 V to -0.59 V, and the corrosion current decreases to 2.78 脳 10 ~ (-6) A / cm ~ (2) after treatment with special Brass alloy in the gas field, and (2) the R( ct) value of N80 steel after corrosion in the produced water after treatment with special Brass alloy in solid solution aging state is larger, and the corrosion potential of N80 steel increases from -0.82 V to -0.59 V, and the corrosion current decreases to 2.78 脳 10 ~ (-6) A / cm ~ (-2). The corrosion inhibition of N80 steel is better. (3) the surface hydrogen evolution current of N80 steel after corrosion without special brass alloy is higher, and the active zone is also more concentrated. However, the surface corrosion of N80 steel treated with special brass alloy treated by solution aging state is lighter, and the active zone and corrosion products are decreased, which can better slow down the corrosion of N80 steel. The results provide a basis for the effective application of alloy materials in preventing or reducing pipeline corrosion.
【作者单位】：西南石油大学材料科学与工程学院;西南石油大学石油与天然气工程学院;
【基金】：“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)
【分类号】：TE983;TG178

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