Rheological Insights into the Performance of High Viscosity Friction Reducers

Abstract This study investigates the rheological behavior and friction reduction performance of five high-viscosity friction reducers (HVFRs) — Xanthan gum, PHPA, Guar gum, PAC-LV, and Starch — across varying concentrations and temperatures. The rheological analyses focus on shear thinning and pseudoplastic flow characteristics, providing insights into optimizing formulations for enhanced flow efficiency and drag reduction in pipeline and oilfield applications. The results show that Xanthan gum and PHPA outperform other polymers in drag reduction efficiency, with Xanthan gum achieving up to 76% drag reduction at 0.5% concentration under low-temperature conditions, and PHPA reaching 78% drag reduction at 0.1% concentration at 158°F, demonstrating superior thermal stability and consistent performance at elevated temperatures. Guar gum exhibits similar flow behavior but with reduced overall efficiency. In contrast, PAC-LV and Starch display poor friction reduction capabilities, with Starch showing negative drag reduction rates and PAC-LV suffering degradation at high temperatures. Xanthan gum demonstrates the steepest viscosity profile at 0.5% concentrations, indicating the strongest shear-thinning capacity at elevated concentrations, while PHPA shows a similar trend at low concentrations of 0.2%. At high shear rates, both polymers reach comparable viscosity plateaus, reflecting similar resistance under operational conditions. Rheological analysis highlights two key parameters: the slope of viscosity reduction and the high-shear viscosity plateau, which together determine friction reduction performance. Amplitude and frequency modulation analyses reveal the effects of polymer concentration on non-destructive deformation, highlighting that increased concentration does not necessarily enhance drag reduction. Xanthan gum and PHPA show expanded linear viscoelastic regions at higher concentrations, contributing to improved viscosity retention and proppant suspension ability in static sand-settling tests.Overall, the study identifies Xanthan gum and PHPA as optimal candidates for field applications requiring effective friction reduction, temperature resilience, and proppant transport. These findings provide valuable guidelines for selecting and formulating HVFRs to improve operational efficiency and reliability in challenging industrial environments.