Комп’ютерне моделювання механічної поведінки бурильних колон у надглибоких похило-скерованих свердловинах

Abstract

The questions of quasistatic equilibrium of elongated curvilinear drill columns are inverbigated. The equations of balance of external and internal forces acting on a drill string in curvilinear well are formulated on the basis of statement of direct and inverse problems of curvilinear flexible rod mechanics. The discending - ascending operations and the drill string rotation during function are considered. The technique of calculation of internal longitudinal force, forces of the drill string interaction with the well wall and friction forces is proposed. An example is considered. It is shown, that even small geometrical imperfections of the well shape essentially influence on the balance of external and internal forces.