The effect of buoyancy is commonly thought of as the

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Unformatted text preview: pyright(c) 2005 by Ali Ghalambor & Boyun Guo 181 182 91 Tension Design Knowing the weights, grades and section lengths based on burst and collapse design, the tension load(both positive and negative ) can be evaluated. The effect of buoyancy is commonly thought of as the reduction I string weight when run in liquid as compares to the string in air. The buoyancy is actually the sum of forces acting on all the exposed, horizontally oriented areas of the casing string. The forces are equal to the hydrostatic pressures at each respective depth times the exposed areas, and defined s negative if acting upward. The areas are the tube end areas, at changing casing weights, and to a negligible degree the shoulders on collars(Fig.30 and 31) . Fig.30 Fig.31 Tension Load Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 184 92 The graphical representation of this combination of design factors is shown in Fig.32. Fig.32 Tension Design Biaxial Design At this point the entire string is designed for burst, collapse and tension, and the weights , grades, section lengths, and coupling types a...
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This document was uploaded on 03/28/2014.

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