Rheologica Acta ( IF 2.3 ) Pub Date : 2021-07-22 , DOI: 10.1007/s00397-021-01287-z Shima Baloochestanzadeh 1 , Shadi Hassanajili 1 , Mehdi Escrochi 2
Gel treatment using preformed particle gels is a technique applied in mature reservoirs to control excess water production. In this study, a novel nanocomposite gel was proposed and optimized for better performance in high-salinity and high-temperature conditions of oilfields. Gels were prepared by grafting copolymerization of crosslinked polyacrylamide onto starch (starch-g-CPAM) and loaded with silica nanoparticles. Different tests were performed on nanocomposite prepared particle gels (NCPPGs) to investigate the effect of silica content (2–10 wt%), temperature, and brine concentration on network structure, swelling, and mechanical behavior of the gels. The NCPPG with 5 wt% showed a superior swelling ratio. Rheological studies depicted that nanosilica could increase the mechanical strength of the NCPPGS in high temperature and high salinity brines (90 °C and 225,000 ppm) up to 900 Pa. Finally, loading nanosilica up to 5 wt. % into the NCPPG resulted in capable mechanical stability and water uptake under harsh conditions.
Graphical abstract
中文翻译:
基于负载纳米二氧化硅的淀粉接枝聚丙烯酰胺纳米复合预制颗粒凝胶的流变性能和溶胀行为
使用预制颗粒凝胶进行凝胶处理是一种应用于成熟油藏以控制过量产水的技术。在这项研究中,提出并优化了一种新型纳米复合凝胶,以在油田的高盐度和高温条件下具有更好的性能。通过将交联聚丙烯酰胺接枝共聚到淀粉(淀粉-g-CPAM)上并负载二氧化硅纳米颗粒来制备凝胶。对纳米复合材料制备的颗粒凝胶 (NCPPG) 进行了不同的测试,以研究二氧化硅含量 (2-10 wt%)、温度和盐水浓度对凝胶的网络结构、溶胀和机械性能的影响。5wt% 的 NCPPG 表现出优异的溶胀率。流变学研究表明,纳米二氧化硅可以将 NCPPGS 在高温和高盐度盐水(90 °C 和 225,000 ppm)中的机械强度提高到 900 Pa。最后,负载纳米二氧化硅高达 5 wt。% 进入 NCPPG 导致在恶劣条件下具有良好的机械稳定性和吸水率。