电场作用下水驱油田采出水稳定性研究

Study on stability of produced water in water flooding oilfield under electric field

采用铂片做电极电解油田采出水,以油田采出水的除油率来表征其稳定性。考察了电解时间、电解温度、电解电流、初始浓度对电场作用下乳状液稳定性的影响。研究结果表明:电解时间小于1.5 h时,油田采出水的除油率随着电解时间的延长而不断增大,当电解时间超过1.5 h后,除油率变化较小。温度为20~80℃时,随着电解温度的升高,油田采出水的除油率不断增大。电流强度为40~80 mA时,除油率随电流强度的增大而增大。随着油田采出水的初始含油质量浓度的增大,除油率也随之增大。并对油田采出水的失稳过程和电场破乳的机理进行了分析。

The platinum sheet is used as electrode to electrolyze the oilfield produced water,and the stability is characterized by the oil removal rate of the oil field produced water.The effects of electrolysis time,electrolysis temperature,electrolysis current and initial concentration on the stability of the emulsion under the action of electric field are investigated.When the electrolysis time is less than 1.5 h,the oil removal rate of oilfield produced water increases with the extension of electrolysis time.When the electrolysis time is more than 1.5 h,the oil removal rate changes little.When the temperature is 20-80℃,the oil removal rate increases with the increase of electrolysis temperature.When the current intensity is 40-80 mA,the oil removal rate increases with the increase of current intensity.The oil removal rate increases with the increase of the initial concentration of oilfield produced water.The instability process of oilfield produced water and the mechanism of electric field demulsification are analyzed.