A single polymer flooding is a widely employed enhanced oil recovery method, despite polymer vulnerability to shear and thermal degradation. Nanohybrids, on the other hand, resist degradation and maintain superior rheological properties at different shear rates. In this article, the effect of coupling CuO nanoparticles (NPs) and nanoclay with partially hydrolyzed polyacrylamide (HPAM) polymer solution on the rheological properties and the recovery factor of the nanohybrid fluid was assessed. The results confirmed that the NP agents preserved the polymer chains from degradation under mechanical, chemical (i.e., salinity), and thermal stresses and maintained good extent of entanglement among the polymer chains, leading to a strong viscoelastic attribute, in addition to the pseudoplastic behavior. The NP additives increased the viscosity of the HPAM polymer at shear rates varying from 10–100 s⁻¹. The rheological properties of the nanohybrid systems varied with the NP additive content, which in turn provided a window for engineering a nanohybrid system with a proper mobility ratio and scaling coefficient, while avoiding injectivity issues. Sandpack flooding tests confirmed the superior performance of the optimized nanohybrid system and showed a 39% improvement in the recovery ratio relative to the HPAM polymer injection.

中文翻译：

---

使用纳米CuO /纳米粘土共混物增强HPAM聚合物驱的性能

尽管聚合物易受剪切和热降解的影响，但单一聚合物驱却是广泛采用的强化采油方法。另一方面，纳米混杂物可抗降解并在不同的剪切速率下保持优异的流变性。在本文中，评估了将CuO纳米颗粒（NPs）和纳米粘土与部分水解的聚丙烯酰胺（HPAM）聚合物溶液偶联对纳米混合流体的流变性和回收率的影响。结果证实，NP剂可保护聚合物链免受机械，化学（即盐度）和热应力作用下的降解，并在聚合物链之间保持良好的缠结程度，除了假塑性行为外，还具有很强的粘弹性。 。^-1。纳米杂化体系的流变性质随NP添加剂含量的变化而变化，这反过来又为工程化具有适当迁移率和比例系数的纳米杂化体系提供了一个窗口，同时避免了注入问题。Sandpack驱油测试证实了优化的纳米混合系统的优越性能，相对于HPAM聚合物注入，其回收率提高了39％。