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These can be schematically represented so that the

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Unformatted text preview: ent total design. Fig.11a Collapse Design Fig.11b Burst Design Tension Design The tentative current design for burst and collapse provides knowledge of weights, grades and section lengths for the designed sections. These can be schematically represented so that the forces acting on this casing string while it is being run are shown(Fig.12). There are two types of forces acting on the casing; buoyant forces and gravitational forces(Fig.12 and 13). 156 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 78 Fig.12 157 The buoyant forces are the product of the pressures times the exposed end area. The gravitational forces are simply the weights of the section. If these forces are quantified and summed form the bottom up, a running tension line representing the tension in the casing at each increment of total length, while being run, can be drawn(Fig.13). Maximum tension design must include consideration of the casing becoming stuck while being run , and the crew pulling on it to free it. A multiplication type design...
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