Nanostructured polymers (NSPs) due to the high water absorption, suitable dispersing in water, low initial viscosity, and deep penetration into the reservoir are potential alternative for common polymers in water shut-off processes. In this study, gelation kinetic of high molecular weight NSPs including copolymer of acrylamide (AAm) and 2-acrylamido-2-methyl-propanosulfonic acid (AMPS) in combination with chromium (III) acetate was studied by bottle test and rheology measurements. Finally, the potential of the NSPs gel to block harsh condition fractures was investigated by performing core flow experiments. The gelation time of 82 h was observed for a gel system containing 5500 ppm of poly(AAm-co-AMPS) nanoparticle and copolymer/cross-linker ratio (CCR) of 20 under aging at 90°C and 87,000 ppm salinity. The results of core flow experiments showed that the NSPs gel has strong blocking capacity to reduce fracture permeability by two orders of magnitude. Furthermore, gel blocking efficiency was found to be depended on both the fracture opening and salinity difference between gel solvent and produced water.

纳米结构聚合物（NSP）由于具有高吸水率，在水中的适当分散性，较低的初始粘度以及对储层的深渗透性，是水切断过程中普通聚合物的潜在替代品。在这项研究中，通过瓶装试验和流变学测量研究了高分子量NSP的凝胶化动力学，包括丙烯酰胺（AAm）和2-丙烯酰胺基-2-甲基丙磺酸（AMPS）与乙酸铬（III）的共聚物。最后，通过进行岩心流动实验研究了NSPs凝胶阻止严酷条件下裂缝的潜力。在90°C老化和87,000 ppm盐度下，对于包含5500 ppm聚（AAm-co-AMPS）纳米颗粒和20的共聚物/交联剂比率（CCR）的凝胶体系，观察到82 h的凝胶化时间。岩心流动实验的结果表明，NSPs凝胶具有很强的封闭能力，可将裂缝渗透率降低两个数量级。此外，发现凝胶的封闭效率取决于裂缝开口和凝胶溶剂与采出水之间的盐度差。