延长油田含硫采出水回注水质处理研究  

Treatment of Sulphur-containing Produced Water for Re-injection in Yanchang Oilfield

作　　者：叶政钦[1] 崔明月[2] 蒋卫东[2] 赫安乐[2] 

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都637001 [2]中国石油天然气股份有限公司勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《西安石油大学学报（自然科学版）》2016年第2期105-111,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省自然科学研究计划项目(编号:2014JM2048)资助

摘　　要：延长油田七里村区块采油污水富含S2-、SO42-、HCO3-、SRB。室内静态腐蚀挂片实验及注水管线腐蚀垢样XRD分析可知,管线腐蚀主要是局部腐蚀,引起腐蚀的主要原因是采出水中高含硫。通过实验筛选出效果较佳的缓蚀剂Xasy-201及杀菌剂FW-BT01、FW-BT02以降低腐蚀速率。采用物理化学法对采出水进行净化处理,优选了污水p H值、除铁剂、无机絮凝剂和有机絮凝剂。结果表明:当调节污水p H值为7.5、铁调剂RF-2质量浓度为25 mg/L,无机絮凝剂PAC质量浓度为30 mg/L、有机絮凝剂PAM(1 200万)质量浓度为1.0 mg/L时,水中悬浮物质量浓度小于10 mg/L,硫含量明显降低,处理后污水的平均腐蚀速率小于0.007 6 mm/a,达到回注水水质标准,且与地层水配伍良好。Oily sewage from Qilicun block of Yanchang Oilfield contains large amounts of S2^-、SO4^2-、HCO3^- and SRB. The laboratory static corrosion coupon experiments and the XRD analysis results of the scale samples from the corroded water injection pipeline show that the corrosion of the water injection pipeline is mainly local corrosion caused by high sulfur content. Corrosion inhibitor Xasy-201 and bactericides FW-BT01 and FW-BT02 are screened through strict experiments to reduce the corrosion rate of the oily sewage. The oily sewage is purified using physical and chemical method. The p H value of sewage,iron removal agent,inorganic flocculantand and organic flocculant are optimized,and the results show that when the p H value of the oily sewage is adjusted to 7. 5,the mass concentration of iron removal agent RF-2,inorganic flocculantand PAC and organic flocculant PAM（ 12 million） is 25 mg / L,30 mg / L and 1. 0 mg / L separately,the mass concentration of the suspended matter in the treated sewage is less than 10 mg / L,the sulfur content of the treated oily sewage obviously decreases,and its corrosion rate is less than 0. 007 6 mm / a. The treated water can reach to the standard for re-injection water,and it is of good compatibility with formation water.

关 键 词：高含硫采出水 腐蚀速率 污水处理 污水回注 

分 类 号：TE992.2[石油与天然气工程—石油机械设备]