Tripability Analysis of Casing Strings in Directional Wells Using the Continuous Beam-Column and Buckling Theory

Table 1

Critical load for the helical buckling of the string in different well sections, where is the critical load of helical buckling (N), is the borehole annulus clearance (m), and is the string radius (m).

Well section	Critical load for helical buckling
Vertical
Straight inclined
Curved
Horizontal