THE ANALYSIS AND APPLICATION OF DOUBLE LAYER CONTACT FINITE ELEMENT ABOUT ROD AND TUBING STRING IN WELL BORE
井简内杆管柱双层接触有限元分析及应用

Constructing the double layer multi-directional contact gap element to describe the random contact problem about slim tubing string with inside and outside string, combining with dimensional beam element and adopting variable and equivalent stiffness to solve equations, the contact condition, the contact position, the size of friction and the generalized inner force, stress and deformation in arbitrary well depth of the rod and tubing string were obtained. The arithmetic example about three wells demonstrated that the corrigendum of hang weight in well head was low by 10 percent. Therefor, it supplied reliable computational methods and theoretical references for designing and failure analysis of the rod and tubing string.