Abstract: In this study we have evaluated the potential of locally sourced clays from the Patos region to be used as base material for water-based drilling fluids in the Patos-Marinza oil field. Four drilling fluid formulations with densities ranging from 1.05 to 1.20 g/cm³ were prepared and tested for density, suspension stability, sedimentation, sand content, filtration, and rheological behavior. The results show that while Patos clays provide acceptable rheological properties and low hydraulic resistance, they have relatively high filtration values and sand content, which may lead to serious problems. In order to overcome this disadvantage, we may need to use additives and filter the clay before use. From an economic perspective, the higher clay dosage and processing costs make them less competitive than imported bentonite under current conditions. However, their favorable flow characteristics suggest potential for use in deeper wells or alternative applications, provided further optimization is carried out.

Keywords: Local Clays, Drilling Fluids, Rheology, Filtration, Oil Field, Feasibility

Pages: 16-26