涡流多相协同臭氧气浮处理特低渗透油田采出水的动力学研究

Dynamics study on treatment of produced water from ultra-low permeability oilfield by eddy-multi-phase coordinated ozone flotation

采用涡流多相协同臭氧气浮技术处理陕北特低渗透油田某油区采出水,并研究反应过程中的影响因素及动力学特性。结果表明:(1)臭氧浓度、紫外灯功率与氧化反应速率常数具有正相关关系,pH、聚合氯化铝(PAC)投加量和入口压力对氧化反应速率常数具有最佳值。最佳条件:臭氧质量浓度为55 mg/L,pH为8.0,紫外灯功率为110 W,入口压力为0.3 MPa,PAC投加量为30 mg/L。(2)该技术处理特低渗透油田采出水的反应过程遵从一级反应动力学方程。(3)基于该技术设计了多功能一体化中试装置并进行现场运行,处理后含油量、COD、悬浮物、细菌含量、平均腐蚀率、硫化物、总铁均达到企业标准要求。

The produced water from ultra-low permeability oilfield was treated by eddy-multi-phase coordinated ozone flotation.And the influence factors and dynamic characteristics of the reaction process were studied.The results showed that:(1)the ozone concentration and UV lamp power had a positive correlation with the rate constant of oxidation reaction,the effects of pH,PAC dosage and inlet pressure on the oxidation reaction rate constant had the best values respectively.The optimum conditions were as follows:ozone mass concentration 55 mg/L,pH 8.0,UV lamp power 110 W,inlet pressure 0.3 MPa,PAC dosage 30 mg/L.(2)When the technology was used to treat the produced water from ultra-low permeability oilfield,the reaction process followed the first-order reaction kinetic equation.(3)Based on this technology,a multi-functional integrated pilot plant was designed and on-site operation was carried out.After treatment,the oil content,COD,suspended solids,bacteria content,average corrosion rate,sulfide and total iron met the requirements of enterprise standards.