摘要
通过模拟新疆油田二元驱采出水各组分组成,考察固体颗粒、聚合物（HPAM）和表面活性剂种类及浓度对油水分离性能和乳化稳定性的影响。结果表明,表面活性剂对二元驱油田模拟采出水稳定性的影响最大,固体颗粒和聚合物的影响较小。相对于高岭土和蛭石颗粒,蒙脱土颗粒对采出水乳化稳定性的影响最为明显。在加量200mg/L时对应最大的含油量和浊度值,分别为807mg/L和1984NTU;当高于200mg/L时对应的含油量和浊度降低,并且对应较高的zeta电位。增大HPAM（M=10×10^6）的浓度,采出水体相黏度升高,超高分子量聚合物具有极强的絮凝性能,在浓度较高时裹挟大量油滴发生絮凝沉降,降低了采出水的乳化稳定性。表面活性剂通过界面顶替和电性作用,直接改变油滴Zeta电位,决定油滴间的碰撞和聚并的发生,主导了采出水的乳化稳定性;表面活性剂对采出水乳化稳定性的影响从大到小依次为：十二烷基苯磺酸钠〉Tween-80〉span-80〉苯扎氯铵。
Simulated polymer/surfactant produced water was prepared according to the practical component of produced water from the polymer/surfactant flooding process in Xinjiang oilfield.Effects of each component including solid particle,polymer（HPAM）and surfactant on emulsion stability of the binary produced water were investigated.Results showed that the surfactant had a significant impact on the emulsion stability,and there were some minor influences for solid particle and polymer.Montmorillonite particle had a clear influence on the emulsion stability over kaolin and vermiculite particles.At montmorillonite dosage of 200 mg/L,the maximum oil content and turbidity of produced water were obtained at 807 mg/L and 1984 NTU,respectively.When the montmorillonite concentration was over 200 mg/L,the oil content and turbidity of produced water were decreased,but the droplet Zeta potential in produced water was high.HPAM（M=10×10^6） could directly affect the bulk viscosity and also destroy the emulsion stability due to its strong flocculation capacity,especially at its high concentration by enhancing the flocculation with oil droplets in simulated produced water.Surfactant could significantly increase the emulsion stability due to its strong interfacial property for changing the Zeta potential of oil droplets and the process of oil droplets collision and coalescence.The surfactants were arranged according to their influence on the emulsion stability of simulated polymer/surfactant produced water in following order：sodium dodecyl benzene sulfonate（DBS）〉 Tween-80〉Span-80〉benzalkonium chloride.
出处
《油田化学》
CAS
CSCD
北大核心
2015年第3期396-400,共5页
Oilfield Chemistry
基金
国家高技术研究发展计划(863计划)项目“短流程废水处理工艺及成套装备研制与产业化”(项目编号2012AA062313)
关键词
油田采出水
聚合物/表面活性剂驱
乳化
稳定性
新疆油田
oilfield produced water
polymer/surfactant flooding
emulsification
stability
Xinjiang oilfield
