Abstract
With effects of drilling pressure, self-excited force, random impacts and contacts of cone bit and rock, the motion and stress distribution of cone bits -drill string is extraordinary complex during oil drilling. Considering the geometry structure and the comprehensive boundary conditions of the full hole drilling-string system, a coupled nonlinear dynamic model of bit-rock-drill-string-well system is set up using Hamilton approach. Then the dynamic simulation is performed and the dynamic characteristics of drill string system are discussed. Computational results reveal numerous interesting characteristics which can be used to forecast the formation of hole trajectory.
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