In recent years, the increase in unwanted water production in oil wells has become one of the major and complex challenges in the petroleum industry. Excessive water production not only significantly increases operational and environmental costs but also leads to reduced well productivity and shortened reservoir life. Consequently, effective water management and control in oil wells have become a priority in petroleum engineering. In this context, the use of novel and efficient methods, particularly polymer gel-based technologies, has gained significant attention as a promising solution. Polymer gels are considered an efficient tool for water shutoff due to their ability to reduce water permeability without significantly affecting oil flow. This study investigates the impact of silica and magnetite nanocomposites, combined with polyvinyl alcohol (PVA) polymer and crosslinking agent formaldehyde, on the properties and performance of polymer gels. Various gel samples were produced, and their characteristics, including viscosity, gelation time, thermal stability, and strength, were evaluated through different experiments. Furthermore, dynamic micromodel, sand-packed column, and core flooding tests were conducted to simulate reservoir conditions. The results showed that the gelation time for these samples ranged from 3 to 4 days after combining with the crosslinker. The viscosities of the four gel samples were measured as 909.8, 979.8, 1088, and 1140 centipoise, respectively. Among the various samples, Gel Sample 21 demonstrated superior performance in all tests. This gel exhibited the highest oil recovery in all three experimental setups: 53.6% in the micromodel test, 42% in the sand-packed column test with a permeability of 3.1 Darcy, and 37% in the core flooding test, which used sandstone with a porosity of 29%, representing a typical oil reservoir environment. These results indicate the excellent performance of Gel Sample 21 in controlling water production and enhan