The monograph describes modern methods of research of complex regularities of changes in physical, mechanical and operational properties, as well as the dependence of their properties on the type, composition and content of ingredients in order to develop optimal compositions of rapastable composite chemical reagents and drilling fluids based on them and technological processes for use in the drilling of oil and gas wells in conditions of rapastrength. Also, they used modern methods of physical-chemical, technological analysis, infrared spectroscopy, X-ray phase, differential-thermal analysis and other standard methods of analysis for developing effective import-substituting, non-deficient, accessible, relatively cheap and environmentally friendly chemical reagents for stabilizing drilling muds based on available raw materials. For specialists in the field of technological chemistry, ecology, engineering and technical workers and laboratory assistants performing work in the fieldof petrochemistry, doctoral students of masters and bachelors of the same specialties.