Evaluating the Impact of Centrifuge-Assisted Solid Control on Mud Rheology and Dilution Cost in Wa-ter-Based Drilling

Abstract

Effective solids control plays a critical role in maintaining drilling fluid perfor-mance and operational efficiency, particularly in Water-Based Mud (WBM) sys-tems. This study examines the impact of centrifuge-assisted solids control on re-ducing low gravity solids (LGS) and improving drilling fluid rheology and cost performance. Field data from offshore wells in the South East Sumatra Block were analyzed to evaluate variations in key fluid parameters under two operating conditions: with and without centrifuge support. The parameters assessed include LGS concentration, plastic viscosity (PV), yield point (YP), gel strength, solids removal efficiency, and total dilution volume and cost. The results show that flu-ids treated with centrifuges maintained LGS levels below 6%, while untreated systems exceeded 10%, particularly in larger borehole sec-tions. This reduction in solids content led to lower and more stable PV and YP values, improving fluid flow and minimizing pressure-related complications. Gel strength values remained within operational limits in centrifuge-treated fluids, reducing the risk of circula-tion loss or formation damage. From a cost perspective, the centrifuge-supported system reduced total dilution volume by more than 90% and cut overall fluid treatment costs by approximately 54.1%, despite the inclusion of equipment costs. The total cost for centrifuge operations was recorded at $10,054.7, compared to $21,899.87 without centrifuge. These findings confirm that centrifuge integration not only enhances fluid stability and solids removal but also delivers measurable economic advantages. The implementation of centrifuge systems represents a practical solution for achieving cleaner, more efficient, and cost-effective drilling operations