Quantifying Parametric Influence on Cuttings Transport in Deviated Deep Wells Using Global Sensitivity Analysis Methods

ABSTRACT Efficient cuttings transport is essential for wellbore stability and minimizing non‐productive time in deviated and horizontal wells. This study applies global sensitivity analysis (GSA) to evaluate the influence of 14 drilling parameters on cuttings transport using WellPlan TM hydraulic simulations. Field‐based parameter distributions were sampled via the Sobol sequence, and 210 runs were analyzed for total cuttings volume, suspended volume, and bed height. Three GSA techniques–regression‐based, variance‐based, and moment‐independent–were used to capture first‐ and second‐order effects. Results reveal two distinct regimes: complete suspension and bed formation. Flow rate, bit size, cuttings density, and rate of penetration emerged as dominant controls, while rheological parameters (yield point, plastic viscosity) had a limited effect within the studied ranges. Graphical methods, including scatter plots and CUSUNORO plots, supported these findings. The integrated GSA framework provides quantitative insights into parameter interactions and operational thresholds, offering a data‐driven basis for optimizing hole‐cleaning strategies in deviated wells.