Siberian Federal University

The article presents a review of modern functional additives for water- based drilling fluids used to improve drilling efficiency and preserve reservoir properties. The following main groups of additives are considered: nanoparticles capable of improving rheological and filtration properties, reducing friction and fluid losses (up to 40 % when using TiO₂); surfactants that improve mud properties by reducing interfacial tension; environmentally safe additives with low toxicity that contribute to sustainable development of the oil and gas industry and reduce production costs. Additionally, natural components of plant origin with biodegradability and promising performance characteristics are considered. Particular attention is paid to polymers acting as swelling and corrosion inhibitors, which allows increasing the resistance of drilling fluids to aggressive conditions. The considered additives allow to optimize the drilling process, reduce the technogenic impact on the environment and increase the working life of the equipment. The article also focuses on the synergetic effects of the combined use of various types of additives, as well as on the potential of their industrial implementation, taking into account modern requirements to environmental friendliness, efficiency and cost-effectiveness. The review reflects current trends in the development of drilling fluids with a focus on stability to thermobaric conditions and environmental safety