NUMERICAL MODELING OF THE ELASTIC BENDING OF A DRILLSTRING IN A CURVED SUPERDEEP BOREHOLE

摘要

The theory of flexible curved rods is used to formulate the problem of the elastic deformation of drillstrings in a superdeep controlled directional well. The axial line of the well is assumed to have geometrical imperfections in the form of local spirals. The dependence of the forces resisting the motion of drillstrings on the amplitudes, pitches, and localization of geometrical imperfections is studied numerically. The numerical results are analyzed.