Selection of drilling fluids and the regulation of their density

In the process of drilling oil and gas wells, the selection and design of drilling fluids play a key role in ensuring the stability and safety of the drilling process. Drilling fluids should ensure wellbore stability, effective cuttings removal and prevention of various complications, such as collapses, mud absorption, gas, oil and water shows and other geotechnical problems. The article dis-cusses in detail the basic principles of selecting drilling fluids, as well as their composition and physicochemical properties, which can vary depending on geological conditions, such as porosity and permeability of rocks, pressure and temperature in the drilling zone. Particular attention is paid to regulating the density of the solution, which is important for preventing destruction and maintaining borehole stability. Also discussed are wellbore flushing methods that allow for effective cleaning of the walls from cuttings, increasing productivity and reducing the risk of contamination. The article also analyzes various ways to prevent complications, such as absorption of the solution in porous rocks, which can significantly increase drilling costs. Examples are given of the use of special additives and modifiers that help improve the properties of the solution, increasing its stability and preventing problems associated with reactions with rocks. Special attention is paid to modern modifications of drilling fluids that have improved properties and function effectively under high temperatures and pressures typical of complex geological situations. Prospects for their future use and possible innovations in this area are considered, which opens up new opportunities for improving the safety and cost-effectiveness of drilling operations.