Effects analysis of the friction on the buckling of horizontal string

Abstract

This paper takes a slight string that is under the constraint of a horizontal circular tube as the analysis model, and then establishes the differential equations about the nonlinear buckling behavior of the constrained tubing string under the consideration of the friction and boundary constraints. The paper also analyzes the sinusoidal buckling critical load under the friction coefficient ranged from 0 to 0.6 and four different boundary constraints. At the same time, the research simulate these four different boundary constraints: SS-SS, SS-C, C-SS, and C-C. The results show that C-C is suggested as the boundary constraint in the process of drilling operation, so that when the friction increases, the method of inhibiting the drill string buckling can be utilized to prolong the life of the drill string and reduce the drilling cost.