The decision will be based on which gives the greater

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Unformatted text preview: factor alone will not suffice as some of the string is in negative tension. Multiplying by same factor will give a larger negative value which is meaningless with regards to designing safety in to a stuck string.The decision will be based on which gives the greater margin of safety(Fig.14) Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 79 Fig.13 Tension Load Fig.14 Tension Design Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 159 160 80 With the design line complete, the casing sections can be designed for tension. At this time the couplings can also be designed(Fig.15). Fig.15 Tension Design 161 Biaxial Corrections To Burst And Collapse Design Axial loads alter the burst and collapse strengths of a casing string. Tension increases burst strength and reduces collapse strength. Compression does just the opposite, increasing collapse strength and decreasing burst strength. The running tension line was calculated and displayed so that the casing string could be designed for the most severe tension loads it might be exposed to. The tensile stresses placed in the casing st...
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