COMPUTER SIMULATION OF RESISTANCE FORCES ACTING UPON CURVILINEAR DRILL STRINGS

摘要

On the basis of the statement and solution of direct and inverse problems of statics of flexible curvilinear rods, we study the stress-strain state of drill strings for deep drilling in a curvilinear well with given geometric parameters. We deduce the resolving equations aimed at the evaluation of the internal forces and moments in a drill string, the forces of contact interaction, and the friction forces between the wall of the well and the drill string in the processes of its lifting, lowering, and rotation. A procedure for the solution of these equations is proposed. An example is presented for a drill string of curvilinear shape.