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山东大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (1): 86-92.doi: 10.6040/j.issn.1672-3961.0.2014.298

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胜坨油田回注水系统金属腐蚀机理研究

孙立梅,崔洁,高国强,卢建平,岑瑗瑗,刘超,穆晓滨   

  1. 中国石化胜利油田有限公司胜利采油厂, 山东 东营 257051
  • 收稿日期:2014-10-23 出版日期:2016-02-20 发布日期:2014-10-23
  • 作者简介:孙立梅(1972- ),女,山东安丘人,工程师,博士,主要研究方向为化学工程与技术.E-mail:t-sunlimei.slyt@sinopec.com
  • 基金资助:
    中国石化胜利油田分公司科技攻关资助项目(KYD1502)

Corrosion mechanism of metal in water injection system for Shengtuo Oilfield

SUN Limei, CUI Jie, GAO Guoqiang, LU Jianping, CEN Yuanyuan, LIU Chao, MU Xiaobin   

  1. Shengli Oil Production Plant of Shengli Oilfield Branch Company, SINOPEC, Dongying 257051, Shandong, China
  • Received:2014-10-23 Online:2016-02-20 Published:2014-10-23

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摘要： 为降低回注水腐蚀率、提升注水水质,以回注水系统中的金属试片为主要研究对象,研究了试片上附着物的组成,并结合回注水中可腐蚀因素讨论了金属腐蚀机理。结果表明,试片上的附着物中,水的质量分数为50%左右,原油的质量分数为11%~33%,无机固体的质量分数为11%~38%,盐酸可溶的无机固体的质量分数为7%~25%,主要为腐蚀产物铁(氢)氧化物与碳酸亚铁、结垢产物碳酸钙镁垢,这主要是由O2与CO2引起的电化学腐蚀造成的,且垢下腐蚀明显。污水中原油可以间接加速腐蚀:原油附着于金属表面将污水圈闭,形成静态腐蚀环境,有利于腐蚀结垢晶体形成。静态试片腐蚀产物中存在FexSy晶体,而在流动状态下,Fe2+与S2-反应形成的硫铁化合物以无定形存在,且污水中与试片上并未含有大量硫酸盐还原菌SRB,因此SRB不是腐蚀的主要因素。

关键词: 回注水, 金属试片, SRB, 胜坨油田, 腐蚀机理

Abstract: In order to lower corrosion rate of injection water and to improve injection water quality, an investigation on corrosion mechanism of metal was put forth based on analysis of attachments on metal slices and corrosive substances in injection water. The results showed that about 50% attachments(mass fraction)was water, 11%~33% was oil, and 11%~38% was inorganic solid. Hydrochloric acid-soluble inorganic solid occupied 7%~25%, which was made of corrosion products iron oxides(iron hydroxides), iron carbonate, and magnesium/calcium carbonate scales. Therefore, the corrosion was electrochemically induced by O2 and CO2, and under deposit corrosion also happened. The crude oil in injection water could accelerate corrosion indirectly. Crude oil attached to metal traps injection water to compose quiet environmental, where crystals of corrosion products and scales formed and grew up easily. Static corrosion on metal slice produced FexSy crystals, while in flowing state, Fe2+ reacted with S2- to form amorphous iron sulfur compounds, and only limited amount of SRB were found either in injection water or on metal slices, which showed that SRB was not the main corrosion factor.

Key words: Shengtuo Oilfield, metal slice, SRB, corrosion mechanism, injection water

中图分类号: 

  • O646.6
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