![]() ![]() The accuracy and comprehensiveness of the buckling model is important for designing tubing. Casing movement, because of thermal expansion or ballooning, can be accommodated with a lower increase in axial load for a buckled casing. The axial compliance of buckled tubing is much less than the compliance of straight tubing. This effect is not as recognized as the first two buckling effects, but is equally important. Tubing buckling causes the relief of compressive axial loads when the both ends of tubing are fixed.Coiled tubing is shorter than straight tubing, and this is an important consideration if the tubing is not fixed. If the stresses in the original configuration were near yield, this additional stress could produce failure, including permanent plastic deformation called “corkscrewing.” Buckling generates bending stresses not present in the original configuration.9.3 Sample buckling length change calculations – tubing movementĪccurate analysis of buckling is important for several reasons:.9.2 Sample buckling bending stress calculations.9.1 Sample buckling length calculations.7 Correlations for buckling strain and length change. ![]() ![]() 6 Correlations for bending moment and bending stress.5 Correlations for maximum buckling dogleg.3 Tubing buckling in oilfield operations.2 Casing buckling in oilfield operations. ![]()
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