Ma Xinru, Yang Haien, Liu Xiaofei, Zeng Lixiang, Li Xinzi, Zheng Lijun, Yang Yu, Cao Lei, Meng Weikai, Zheng Junping
Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin 300072, China.
Xi'an Changqing Chemical Industry Group Co., Ltd., Xi'an 710021, China.
Polymers (Basel). 2024 Apr 12;16(8):1085. doi: 10.3390/polym16081085.
Polyacrylamide, silica, and other nanoparticles have all been realized in the field of enhanced oil recovery. Researchers often explore the mechanisms of spreading behavior and simulated displacement to develop more efficient types of nanoparticles. In this study, copper quantum dots were introduced into a acrylamide copolymerization system to obtain composite nanospheres and its structure, topographic, and application performance were characterized. The results show that the composite nanospheres have a particle size of around 25 nm, are uniformly loaded with copper particles, and have good temperature resistance. The spreading ability on the quartz flake surfaces and displacement effect in microchannels of composite nanospheres, acrylamide copolymer nanospheres, and copper quantum dots were compared by nanofluid spreading experiments and microchannel chip oil displacement experiments. The results indicate that the composite nanospheres can effectively reduce the water contact angle, promote the spreading of aqueous phase, and accelerate the oil droplet removal process; the accelerating effect is stronger than other samples. Its oil displacement effect is also the strongest, and it is minimized by the influence of channel size, temperature, and dispersing medium, with better stratigraphic adaptability. This work supports the practical application of copper quantum dot/polyacrylamide composite nanospheres in the oilfield.
聚丙烯酰胺、二氧化硅和其他纳米颗粒在提高石油采收率领域均已得到应用。研究人员经常探索其铺展行为和模拟驱替的机制，以开发更高效的纳米颗粒类型。在本研究中，将铜量子点引入丙烯酰胺共聚体系以获得复合纳米球，并对其结构、形貌和应用性能进行了表征。结果表明，复合纳米球的粒径约为25 nm，铜颗粒负载均匀，且具有良好的耐温性。通过纳米流体铺展实验和微通道芯片驱油实验，比较了复合纳米球、丙烯酰胺共聚物纳米球和铜量子点在石英片表面的铺展能力以及在微通道中的驱替效果。结果表明，复合纳米球能有效降低水接触角，促进水相铺展，加速油滴去除过程；加速效果比其他样品更强。其驱油效果也最强，受通道尺寸、温度和分散介质的影响最小，具有更好的地层适应性。这项工作支持了铜量子点/聚丙烯酰胺复合纳米球在油田中的实际应用。
