新型荧光示踪纳米微球制备及性能评价

Preparation and performance evaluation of novel fluorescent tracer nanoparticles

目前,渤海油田纳米微球调驱及"凝胶+纳米微球组合"调驱技术已经进行了大范围矿场试验,但产出液中微球浓度监测却一直未找到有效方法。针对矿场实际技术需求,本文提出采用凝胶包埋法将碳量子点引入到普通纳米微球中设想,并建立了新型荧光示踪纳米微球制备方法,同时开展了新型荧光示踪纳米微球荧光性能、微观结构和封堵性能评价。结果表明,随老化时间延长和地层水pH值增加,微球荧光性能呈现不同程度减弱趋势,总体上荧光性能较好。与普通纳米型微球相比,新型荧光示踪纳米微球在注入性及封堵能力上相差不大。荧光光谱曲线峰值与荧光微球浓度间呈正比例线性相关,通过检测产出液中荧光微球的荧光光谱曲线峰值反推微球浓度,此种方法不仅操作简便而且测试结果准确。

At present,the Bohai oilfield has been widely applied in the field of nanometers flooding and"gel+nanospheres".However,the problem of microsphere concentration detection has not been effectively solved.In order to solve this problem,this paper proposes a new preparation method of fluorescent tracing nano microspheres.Innovation is proposed to introduce carbon quantum dots into ordinary nanospheres by gel embedding.In this paper,the fluorescence properties and microstructure of the new fluorescent tracer nanospheres were experimentally analyzed.The influence factors of concentration,aging time and pH value of formation water on fluorescence intensity and percolation characteristics of new fluorescent tracer nano microspheres were studied.The results show that the fluorescence performance of the new fluorescent tracer nanoparticles is better.With the aging time and the higher pH value of formation water,the fluorescence properties of microspheres will be weakened in varying degrees.Compared with the ordinary nanospheres,the new fluorescent tracer nanoparticles have little difference in injectability and plugging ability.There is a positive proportional linear correlation between the peak value of fluorescence spectrum curve and the concentration of fluorescent microspheres.The concentration of microspheres can be deduced by detecting the peak value of fluorescence spectrum curve of fluorescent microspheres in the output liquid.This method is not only simple but also accurate.