Abstract
The rheological performance of oil-based drilling fluids was enhanced using graphene nanosheets and graphene–boron nitride hybrid nanoparticles. Optimized rheology is critical for efficient cuttings transport, wellbore stability, and cost-effective drilling. Graphene nanosheets (100–1500 mg/L) increased apparent viscosity (AV) by up to 90% and plastic viscosity (PV) by up to 106% compared to the base mud across 140–240 °F, with negligible density change. The graphene–boron nitride hybrid system exhibited concentration-dependent nonlinear behavior: viscosities decreased at low concentrations (100–500 mg/L) but rose markedly at higher concentrations (1000–1500 mg/L), achieving up to 164% increase in AV and 71% in PV at 1500 mg/L and 240 °F relative to the base fluid. This synergistic effect arises from graphene’s lubricating properties combined with boron nitride’s structural reinforcement, enabling formation of a robust nanoparticle network that resists thermal thinning. These findings demonstrate that hybrid nanoparticles offer a tunable, effective strategy to customize drilling fluid rheology, improve hydraulic efficiency, reduce torque and drag, and lower operational costs in high-temperature environments.
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The authors thank Shahid Chamran University of Ahvaz for their support.
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Rashid Pourrajab: Formal analysis, Supervision, Conceptualization, Investigation, and Writing-Original Draft. Mohammad Behbahani: Conceptualization, Supervision, Investigation, Validation, Writing-Review & Editing. Seyed Nasser Mousavi: Formal analysis, Conceptualization, Validation, Writing-Original Draft.
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Pourrajab, R., Behbahani, M. & Moosavi, S.N. Optimizing drilling fluid rheology with hybrid nanoparticles boron nitride and graphene nanosheets: an experimental study. Sci Rep (2026). https://doi.org/10.1038/s41598-026-46779-1
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DOI: https://doi.org/10.1038/s41598-026-46779-1
