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This research aims to develop a framework linking nozzle geometry to hydraulic energy efficiency in roller cone drilling.

Optimization of nozzle geometry for improving bottomhole cleaning efficiency in roller cone drilling

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This research aims to develop a framework linking nozzle geometry to hydraulic energy efficiency in roller cone drilling.
Utilized submerged free-jet decay relation and cuttings-particle force balance for analysis.
Implemented a parametric grid search to optimize nozzle diameter, inclination angle, and stand-off distance.
Compared five representative nozzle configurations to determine the optimal parameters.
Recommended optimum nozzle diameter of 18 mm, inclination angle of 20°, and stand-off distance of 50 mm.
Achieved an 86% reduction in hydraulic energy from 35.95 to 5.04 MJ/m.
Increased predicted rate of penetration from 11.3 to 22.0 m/h, a 95% improvement compared to conventional arrangements.

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Randomized trial shows improved bottomhole cleaning efficiency in roller cone drilling, indicating optimized nozzle design benefits.

Nazarbekova et al. (2026) studied this question.

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