Yang Wenwen, Lai Xiaojuan, Wang Lei, Shi Huaqiang, Li Haibin, Chen Jiali, Wen Xin, Li Yulong, Song Xiaojiang, Wang Wenfei
College of Chemistry and Chemical Engineering, The Youth Innovation Team of Shaanxi Universities, Shaanxi University of Science & Technology, Xi'an 710021, China.
Shaanxi Agricultural Products Processing Technology Research Institute, Xi'an 710021, China.
Polymers (Basel). 2024 Oct 13;16(20):2884. doi: 10.3390/polym16202884.
Urethane surfactants (REQ) were synthesized with octadecanol ethoxylate (AEO) and isocyanate methacrylate (IEM). Subsequently, reactive-carbamate-surfactant-modified nanomicrospheres (PER) were prepared via two-phase aqueous dispersion polymerization using acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and ethylene glycol dimethacrylate (EGDMA). The microstructures and properties of the nanomicrospheres were characterized and examined via infrared spectroscopy, nano-laser particle size analysis, scanning electron microscopy, and in-house simulated exfoliation experiments. The results showed that the synthesized PER nanomicrospheres had a uniform particle size distribution, with an average size of 336 nm. The thermal decomposition temperature of the nanomicrospheres was 278 °C, and the nanomicrospheres had good thermal stability. At the same time, the nanomicrospheres maintained good swelling properties at mineralization < 10,000 mg/L and temperature < 90 °C. Under the condition of certain permeability, the blocking rate and drag coefficient gradually increased with increasing polymer microsphere concentration. Furthermore, at certain polymer microsphere concentrations, the blocking rate and drag coefficient gradually decreased with increasing core permeability. The experimental results indicate that nanomicrospheres used in the artificial core simulation drive have a better ability to drive oil recovery. Compared with AM microspheres (without REQ modification), nanomicrospheres exert a more considerable effect on recovery improvement. Compared with the water drive stage, the final recovery rate after the drive increases by 23.53%. This improvement is attributed to the unique structural design of the nanorods, which can form a thin film at the oil-water-rock interface and promote oil emulsification and stripping. In conclusion, PER nanomicrospheres can effectively control the fluid dynamics within the reservoir, reduce the loss of oil and gas resources, and improve the economic benefits of oil and gas fields, giving them a good application prospect.
用十八醇乙氧基化物（AEO）和异氰酸酯甲基丙烯酸酯（IEM）合成了聚氨酯表面活性剂（REQ）。随后，通过使用丙烯酰胺（AM）、2-丙烯酰胺基-2-甲基丙烷磺酸（AMPS）和乙二醇二甲基丙烯酸酯（EGDMA）的两相水分散聚合制备了反应性氨基甲酸酯表面活性剂改性的纳米微球（PER）。通过红外光谱、纳米激光粒度分析、扫描电子显微镜和内部模拟剥离实验对纳米微球的微观结构和性能进行了表征和研究。结果表明，合成的PER纳米微球粒径分布均匀，平均粒径为336nm。纳米微球的热分解温度为278℃，具有良好的热稳定性。同时，纳米微球在矿化度<10000mg/L和温度<90℃时保持良好的溶胀性能。在一定渗透率条件下，封堵率和阻力系数随聚合物微球浓度的增加而逐渐增大。此外，在一定的聚合物微球浓度下，封堵率和阻力系数随岩心渗透率的增加而逐渐减小。实验结果表明，用于人工岩心模拟驱替的纳米微球具有较好的驱油采收能力。与AM微球（未用REQ改性）相比，纳米微球对采收率的提高作用更为显著。与水驱阶段相比，驱替后的最终采收率提高了23.53%。这种提高归因于纳米棒独特的结构设计，其可以在油水岩界面形成薄膜，促进油的乳化和剥离。总之，PER纳米微球可以有效控制油藏内的流体动力学，减少油气资源的损失，提高油气田的经济效益，具有良好的应用前景。
