One of the main problems in the wells drilling is to ensure the stability of clay rocks. The problem of the study is that the existing flaws in the physicochemical methods for assessing the condition and composition of clay rocks and shale which do not allow effective influence on the fastening, lubricating and anti-gripping properties of drilling fluids during well construction. The purpose of the study is to develop a universal inhibited drilling mud for accident-free drilling of ultra-deep wells in complex mining and geological conditions under abnormally high reservoir pressure. A study was conducted using various methods to select the required formulation of an inhibited drilling mud that needed to be resistant to high downhole temperatures and reservoir pressures. The study of clay rocks of the well section No. XX1 of the Bugdaili area showed that they have a sufficiently high colloidality for deep-lying clays, since they have a high content of montmorillonite. A study of the characteristics of the drilling mud revealed that samples of solutions No. 1, 2, and 3 had a strong inhibitory effect. The most effective sample of solution was No. 3, which was able to ensure a stable state of clay rocks for 90-100 days. A study of the interaction of the ALKAR-3 alumina-calcium drilling mud system with clay rocks conducted in the fields of the southwestern region of Turkmenistan revealed that the inhibitory effect of solution No. 3 can be further enhanced by the addition of 3% potassium chloride. The results of the study can be used in the preparation of inhibited drilling fluids for successful drilling of deep wells in the areas of deposits with complicated conditions associated with instability of the wellbore.
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