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<p>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&#xa0;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&#xa0;°F, with negligible density change. The graphene–boron nitride hybrid system exhibited concentration-dependent nonlinear behavior: viscosities decreased at low concentrations (100–500&#xa0;mg/L) but rose markedly at higher concentrations (1000–1500&#xa0;mg/L), achieving up to 164% increase in AV and 71% in PV at 1500&#xa0;mg/L and 240&#xa0;°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.</p>

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Optimizing drilling fluid rheology with hybrid nanoparticles boron nitride and graphene nanosheets: an experimental study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月2日

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  • Rashid Pourrajab,
  • Mohammad Behbahani,
  • Seyed Nasser Moosavi

摘要

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.