PARTICLE SIZE DISTRIBUTION CRITERIA FOR LOST CIRCULATION MATERIALS (LCM) IN THE DRILLING FLUIDS LABORATORY OF PT. COSL INDO

Abstract

The acceleration of technological advancements and increasing energy demands necessitates continuous improvements in drilling operations, particularly in addressing challenges related to fluid loss during drilling. This study focuses on optimizing Particle Size Distribution (PSD) criteria for Lost Circulation Materials (LCM) in drilling fluids, as analyzed in the laboratory of PT. COSL Indo. The analysis was conducted using the Malvern Mastersizer 3000, a cutting-edge PSD analyzer, to evaluate calcium carbonate (CaCO₃) particles as LCM. Laboratory tests aimed to identify optimal PSD parameters, including D10, D50, D90, and granularity span (Sp), to ensure effective sealing in fractured formations. The research methodology incorporated established theories, such as the criteria proposed by You (2018) and Wang (2019). The tested LCM demonstrated partial compliance with PSD criteria, meeting the granularity span threshold (≥ 1.5) and producing lesser fluid loss than particles with a granularity span below the threshold. However, the result shows that adjustments in D10 value are required to achieve better efficiency. According to the theories, the CaCO₃ particles proves effective for a fracture with an opening width of 496.163 μm and largest pore throat size of 347.314 μm with a 10% relative deviation to achieve maximum throat plugging effect. This study highlights the importance of PSD optimization in designing LCM for drilling operations to enhance sealing efficiency, reduce fluid loss, and support sustainable energy exploration. Further refinements and field applications are recommended to validate and extend the applicability of these findings to various conditions in real life field operations.