Experimental and statistical analysis of MWCNT hybrid nanofluid-based multi-functional drilling fluid

The current study developed a novel MWCNT-Fe2O3/water-based drilling fluid. Hybrid nanofluids are a new type of nanofluids that are produced by dispersing multiple nanoparticles in a base fluid. Because MWCNTs have a higher thermal conductivity than Fe2O3 at room temperature, the current study used both nanoparticles in a mixing ratio of 80 and 20 (vol %). To ensure proper dispersion of MWCNT in water, sodium oleate is used as a surfactant. After mixing the nanofluids into the bentonite-based drilling fluid, its thermophysical properties are experimentally studied and statistically validated using RSM. DLS, zetapotential, and sedimentation studies all confirm that the ultrasonic cavitation technique (100% intensity-30 min) maintains drilling fluid's stability. The results showed that the addition of nanofluids significantly increased the thermal conductivity of the drilling fluid. The thermal conductivity enhancement was approximately 414% for 0.5 vol% hybrid nanofluid-based drilling fluid. RSM studies optimized the input parameters A, B, and C-0.5 vol%, 60 degrees C, and 30 min, respectively, to increase drilling fluid thermal conductivity from 0.7 to 3.91 W/mK. The ANOVA statistical analysis confirmed that nanofluid concentration and temperature had a significant effect on drilling fluids thermal conductivity. Finally, the significant improvement in thermal conductivity demonstrates the effectiveness of nanofluid addition in the drilling fluid's performance.

Automated summary

The study developed a novel MWCNT-Fe2O3/water-based drilling fluid, which utilized hybrid nanofluids by dispersing multiple nanoparticles in a base fluid. The addition of nanofluids significantly increased the thermal conductivity of the drilling fluid, with a thermal conductivity enhancement of approximately 414% observed for 0.5 vol% hybrid nanofluid-based drilling fluid. RSM studies optimized the input parameters to enhance the drilling fluid's thermal conductivity. The significant improvement in thermal conductivity demonstrates the effectiveness of nanofluid addition in the drilling fluid's performance.