Abstract: According to actual vibrational state of the drill string, by the energy method, the integrated dynamic model of the drill string system is set up that included endwise, sidewise, torsion three of kind vibrational states, the principle of drill string bring vibration is analyzed. At the same time, combining aiguille-rock mutual dynamic relation, the numerical calculation the method and flow of the integrated dynamic model of the drill string system is developed. Dynamic simulation experiments are completed.

Key words: Drill string, Dynamic, Simulation