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A cost-effective design meets all the design criteria with the least expensive available pipe. The selection process consists of comparing pipe ratings with design loads and applying minimum acceptable safety standards (i.e., design factors). The detailed design phase includes selection of pipe weights and grades for each casing string. The quality of the gathered data will have a large impact on the appropriate choice of casing sizes and shoe depths and whether the casing design objective is successfully met.
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4.2.4 Casing shoe depths and the number of strings.