Medium- and large-scale full-scale modeling of drilling and well cleaning processes in the laboratory is being carried out by many researchers, both in Russia and abroad. Experiments carried out at M-I SWACO (USA) are considered to be particularly significant studies that have found wide application in the practice of drilling wells. The results of the research were presented in 2001 as a guide for drilling fluid engineers. Scientists have determined the critical zenith angles (range 45-60 deg) at which cuttings particles are insufficiently carried out of the well. Many other factors influencing well cleaning were analyzed, and recommendations were made for the construction of wells of various trajectories. In 2012, Malaysian researchers conducted full-scale experiments to study the effect of mud viscosity and velocity, as well as the zenith angle, on the transport of drilled particles in deviated and horizontal wells [24]. In 2016, Iranian researchers developed an experimental stand and published the results of studies [25] on the influence of the zenith angle, the speed of the DS, the consumption of DF and the cuttings fraction on the cleaning of an inclined well. In 2019, an employee of RN-Vankor published the results of a study of the effect of DS rotation on cuttings transport in a horizontal well, obtained on a small-scale experimental bench. The influence of DS rotation on mud transport was confirmed, as well as a decrease in the \"turbulent effect\" with an increase in DF viscosity [13]. In 2018-2019 a group of international researchers published the results of the effect of rotation of the DF on cleaning the well with the use of polypropylene particles in DF at different zenith angles [26; 27; 28]. In 2020-2021 a group of Norwegian scientists published the results [29; 30] of hydraulic studies and mud transport with oil-based solutions in deviated wells, using a large-scale laboratory facility developed with the support of Aker BP and M-I SWACO. The above studies confirmed the presence of critical zenith angles of the well trajectory, described the effect of the rotation speed of the drilling rig, volumetric flow, technological and mud rheological properties on the quality of wellbore cleaning of cuttings. However, the effect of DS buckling on the destruction of mud plugs and mud carryover has not been addressed in any of the above works, due to the fact that engineers are trying to predict and exclude the buckling phenomenon [21; 31; 32; 33], and the positive effect of controlled DS buckling on well cleaning has hardly been considered. The purpose of the study is to determine the effect of DS buckling on the breakdown of mud plugs and the cleaning of deviated wells from cuttings, taking into account drilling parameters, zenith angle and mud properties. To achieve this goal, two series of applied field studies were carried out using muds with different rheological models. The development of a technology to improve the quality of well cleaning, which is based on the operational control and management of the number and lengths of half-waves of DS and their hydromechanical effect on mud plugs, taking into account the drilling parameters, zenith angle and mud properties, will improve the efficiency of the construction of directional wells. The present study includes the determination of DS spatial shape influence on the sludge plugs' destruction and deviated wells cleaning from cuttings. The main idea of the study is not to fight against DS buckling, as a negative effect that one way or another occurs when drilling wells with long or complex trajectories, but to use this phenomenon to advantage--to control and manage buckling, artificially creating DS bends in places where cuttings accumulate.