Operational control of the forward movement of the “chisel-face” system

Doklady Bashkirskogo Universiteta. 2019. Volume 4. No. 1. pp. 13-23.

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The article proposes a new mathematical model of the deep hole drilling process, which takes into account the interaction of the drill string with the bottomhole ("chisel-face" system). Equations describing the forvard movement of the chisel taking into account the hole deepening are obtained. The main attention is paid to the problem of operational control of the translational motion of the drill string. As a control parameter, it is suggested to consider the external load on the chisel. Conditions are obtained for the control parameter, which ensure the most efficient functioning of the system. A dynamic model of translational motion in the system of "chisel-face" is developed, which explains the mechanisms of the origin of vibrational and resonant phenomena. The proposed model can be useful in solving problems of operative control of the drilling process with the aim of increasing the efficiency of operation under different conditions with varying depth of the well, and also for the development of appropriate automated information and control systems. The obtained conditions for the optimal functioning of the "chisel-face" system make it possible to evaluate the effect on the indicators of the bottom hole destruction efficiency of the main design parameters of the chisel, and also to determine the geological parameters of the bottom by the dynamic characteristics of the chisel.