油井酸化返排液油水分离效率的影响因素  

Influencing Factors of Oil-water Separation Efficiency of Oil Well Acidified Back-flow Fluid

作　　者：王崇 WANG Chong(Oilfield Production Division,China Oilf ield Services Co.,Ltd.,Tianjin 300459,China)

机构地区：[1]中海油田服务股份有限公司油田生产事业部,天津300459

出　　处：《化工管理》2021年第4期193-194,共2页Chemical Engineering Management

摘　　要：酸化是海上油田广泛应用的增产措施之一,酸化措施后,油井酸化返排液经过电脱水器时跳闸现象频发,导致油水分离效率低,严重影响了油田正常的生产流程。为此,在分析酸化返排液电破乳机理的基础上,实验考察了机械杂质含量、pH值、进液温度、高价阳离子类型及含量对油井酸化返排液油水分离效率的影响。结果表明:机械杂质含量增至50 mg/L后会显著影响返排液油水分离效率;强酸及强碱环境均不利于返排液脱水,pH值为7左右时,酸化返排液油水分离效果最好;高价阳离子(Ca^2+、Mg^2+、Fe^3+)使返排液油水分离效率有所降低,其中铁离子影响最大,且当铁离子浓度高于300 mg/L后,电脱水装置无法稳定运行。Acidification is one of the widely used measures to increase production in offshore oilfields.After acidification,the tripping phenomenon of the oil well acidified back-flow fluid passing through the electric dehydrator frequently occurred,resulting in low oilwater separation efficiency,which seriously affected the normal production process of the oilfield.Therefore,based on the analysis of the mechanism of electric demulsification of acidified back-flow fluid,the effects of mechanical impurity content,pH value,inlet temperature,type and content of highvalence cations on the oil-water separation efficiency of acidified back-flow fluid in oil wells were experimentally investigated.The results show that increasing the mechanical impurity content to 50 mg/L will significantly affect the oilwater separation efficiency of the back-flow fluid;strong acid and alkali environments are not conducive to the dehydration of the backflow fluid,and when the pH is around 7,the oil-water separation effect is best.High-valence cations(Ca^2+,Mg^2+,Fe^3+)reduce the oilwater separation efficiency of the reflux liquid.Among them,iron ions have the greatest effect.When the iron ion concentration is higher than 300 mg/L,the electric dehydration device cannot run stably.The results provide a countermeasure for the efficient treatment of acidified back-flow fluids in offshore oilfields.

关 键 词：酸化 返排液 电脱水 油水分离 

分 类 号：TE357[石油与天然气工程—油气田开发工程]