Abstract: The problem about computer simulation of whirl vibrations of a drill bit is considered. The dynamic process is assumed to be in an incipient stage when the bit rolls on the borehole bottom without reaching the well wall. ...

Abstract: This paper deals with simulating the energysaving regimes of drilling deep curvilinear boreholes with prescribed geometrical imperfections of their axial lines. On the basis of the theory of curvilinear flexible elastic ...