安塞油田酸性采出水回注水的腐蚀性及改性研究  

Study on the corrosion performance and modification of acidic re-injection water in Ansai Oilfield

作　　者：山城 王瑶[1] 王玉龙[2] 吴婷婷[1] 刘岚馨[1] 燕永利[1] 

机构地区：[1]西安石油大学化学化工学院,陕西西安710065 [2]河南油田分公司第一采油厂,河南南阳474780

出　　处：《西安石油大学学报（自然科学版）》2015年第1期100-104,10,共5页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省自然科学研究计划(编号:2014JM2048);陕西省教育厅自然科学研究计划(编号:2013JK0675)

摘　　要：对安塞油田王南塞160区块酸性采出水回注造成地面系统、井筒的严重腐蚀现象进行了分析。选取王十六转集输站酸性采出水进行室内静态腐蚀挂片测试及其SEM结构分析,结果表明安塞油田采出水对挂片的腐蚀速率远远小于控制指标,采出水系统造成的均匀腐蚀不严重,主要产生局部腐蚀。分别采用SEM和XRD对腐蚀结垢进行研究,结果表明腐蚀与结垢并存,造成腐蚀的主要因素是溶解氧、HCO3^-和细菌,主要腐蚀产物为FeO（OH）。为了控制污水的酸性腐蚀,对王十六转采出水进行改性和性能评价。在240-350 mL/t污水中加入10%NaOH溶液,将酸性水pH值调节至7.0左右,改性后水中∑Fe、SO4^2-、HCO3^-含量明显降低,从而降低采出水的腐蚀速率和结垢趋势。The severe corrosion of ground and wellbore system caused by the acidic re-injection water in Wangnansai 160 block of Ansai Oilfield is analyzed. The corrosion performance of the acidic produced water in Wang 16 gathering station is studied by laboratory static coupon corrosion tests,and the corroded coupons are analyzed by SEM. It is shown that the corrosion rate of the coupons is far less than control indicator,and their corrosion form is mainly local corrosion. The corrosion scale is studied by SEM and XRD,and the results indicate that there are corrosion and scaling at the same time,which is caused by dissolved oxygen,HCO-3and bacteria. The corrosion product is FeO(OH). The acidic re-injection water is modified using NaO H of volume fraction 10%,and the NaO H solution of40 ~ 350 mL is added into a ton of acidic produced water,which can make the pH value of the acidic produced water reach to about 7.The content of ∑Fe,SO2--4,HCO3 in the modified acidic produced water is significantly reduced,and therefore the corrosion and scaling rate of the produced water is reduced.

关 键 词：酸性采出水 回注 腐蚀速率 腐蚀结垢 酸性水改性 安塞油田 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]