Development of Nano‐Enhanced Polymer Gel for Water Shut‐Off Applications in Harsh Environments

ABSTRACT Water production management in high‐temperature and high‐salinity oil reservoirs remains an unresolved challenge due to the instability and weak mechanical performance of conventional polymer gels. This research aimed to synthesize and evaluate magnesium oxide–polyacrylamide (MgO‐HPAM) nanocomposite gels for improving thermal resistance, mechanical strength, and long‐term stability under extreme operational conditions. The MgO nanoparticles were dispersed in water through sonication and stabilized with HPAM polymer to form a homogeneous nanocomposite solution, followed by crosslinking with HMTA and HQ to generate a robust gel network. The gelation time, storage ( G ′) and loss ( G ″) moduli, syneresis resistance, and performance in porous media were systematically assessed. Dynamic light scattering confirmed dispersion stability up to 250 ppm MgO concentration with minimal aggregation (< 70 nm size after 60 days). Rheological measurements showed reinforcement of the elastic network ( G ′ ≈ 820 kPa vs. 340 kPa for nano‐free) and improved strain tolerance. Under 110°C and 2000 psi conditions, syneresis reduced from 52% to 8%, confirming enhanced structural retention. Core flooding tests in sandstone plugs revealed a three‐fold increase in resistance factor (3750 vs. 1250) and over 25‐fold improvement in residual resistance after 60 days, demonstrating superior water‐blocking efficiency and durability of the nanocomposite gel. SEM micrographs verified homogeneous nanoparticle distribution and reduced pore heterogeneity, while FT‐IR and TGA analyses confirmed chemical interaction and improved thermal stability. The study concludes that MgO‐HPAM nanocomposite gels provide a promising route toward sustainable water shut‐off systems for mature reservoirs.

Ҳали таржима қилинмаган