Insights Into Barite Particle Size and Perlite Integration to Advanced Drilling Fluids Efficiency

Abstract Barite is a widely used weighting material in water-based drilling muds (WBMs) due to its high specific gravity and cost-effectiveness. However, variations in barite particle size distribution (PSD) can significantly impact drilling fluid performance, influencing properties such as filtration, rheology, and formation damage. This study examines the influence of barite PSD on these key properties and explores the potential of perlite as an additive to enhance drilling fluid performance. To achieve this, three barite grades with distinct PSDs were prepared using sieving and ball milling. These were used to formulate three distinct drilling muds, which were then characterized and tested through laboratory analyses, including particle size analysis, scanning electron microscopy (SEM), x-ray diffraction (XRD), and high-pressure high-temperature (HPHT) filtration tests. The methodology aimed to evaluate the effects of PSD variations and perlite addition on filtration behavior, filter cake characteristics, and rheological properties. The results demonstrated that barite PSD significantly affects drilling fluid properties. Smaller barite particles enhanced mud stability and minimized filtration issues, whereas larger particles increased filter cake thickness and permeability, potentially leading to greater formation damage. Notably, the addition of perlite improved rheological stability, reduced filter cake thickness, and optimized overall fluid performance, with the most significant improvements observed in muds with larger barite particles in terms of filter cake features. These findings underscore the importance of optimizing barite PSD and incorporating appropriate additives such as perlite to design more efficient and cost-effective drilling fluid formulations. Such advancements contribute to safer and more economical petroleum extraction operations.