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This article discusses the types of vibrations that occur in the downhole drill string assembly (DDSA) during drilling, as well as the causes, consequences and methods of their damping. It was found that the considered methods for reducing such vibrations as axial, torsional and radial methods do not always allow to achieve the desired results. In this case, the most effective way to eliminate them is damping devices. A modernized design of a hydromechanical damper is proposed. A modernized design of a hydromechanical damper (DGM-240) is proposed, in which the vibration damping occurs with a package of disk springs, and the rod is made with a helical groove that allows damping torsional vibrations. A mathematical model was developed describing the DDSA work, represented by a system of second-order differential equations, which was solved using the MathCAD 2015 software package. The graphs of vibrations in the DDSA without and with a modernized damper were built and analyzed. Ключевые слова: вибрация, демпфирующее устройство, скважинное оборудование, бурильная колонна, долото, бурение скважин

DAMPING DEVICE MODERNIZATION AND ANALYSIS OF THE DOWNHOLE DRILL STRING ASSEMBLY CAPABILITY