Moscow: "Nedra", 1975 - 272 with . The book is devoted to an important problem - the control of the behavior of rocks during drilling wells and the regulation of the properties of drilling fluids. The influence of various factors on the swelling of clay rocks is considered. The change of physicochemical properties of clay pastes is analyzed. The properties, technology of obtaining and conditions for the use of new chemical reagents used for the treatment of drilling muds, as well as laboratory and field research of new types of chemical processing of drilling muds are described. Methods of regulation of solid phase content in drilling fluids. The thermo- and salt-resistant formulations of drilling fluids . are given. The book is intended for engineering and scientific workers of drilling enterprises of oil and gas industry. It is useful for senior students of oil and gas field specialties.