Application of Organoclays in Oil-Based Drilling Fluids: A Review

Organoclays (OCs),formed by surface modification of clay mineralsusing organic compounds, are typical additives for providing rheologyfor oil-based drilling fluids (OBDFs). There are different studieson the effect of OCs on the rheological properties of oil-based systemsunder high-pressure, high-temperature (HPHT) conditions, but findingnew OCs as rheology control agents is attractive for drilling fluidengineers. This work reviews different OCs used in OBDFs, namely,organo-montmorillonite (OMMT), organo-sepiolite (OSEP), and organo-palygorskite(OPAL). Furthermore, the structure of OCs in OBDFs, their rheologicalproperties, and the thermal stability of OCs were investigated. Besides,the role of fibrous and layered OCs in enhancing the rheological propertiesof OBDFs is illustrated. Finally, the synergistic use of differentOCs to enhance the thermal stability and rheological properties ofthe OBDFs is presented. The study highlights research gaps and recommendationsfor research approaches and potential areas that need further investigation.The application of OCs in OBDFs is a wide field and has huge potentialto be developed. The use of OCs in OBDFs will promote developmentin the oil and gas industry.

Automated summary

This study reviews the application of different types of organoclays in oil-based drilling fluids (OBDFs), investigating their structures, rheological properties, and thermal stability. The study also illustrates the role of fibrous and layered organoclays in enhancing the rheological properties of OBDFs, as well as the synergistic use of different organoclays to improve thermal stability. The research highlights gaps in knowledge and provides recommendations for further investigation in this field. The application of organoclays in OBDFs has significant potential for development and contributes to progress in the oil and gas industry.