In this paper, the collapse resistance attributes of pipe will be identified. The qualitative and quantitative effect of each of the attributes will be demonstrated. Also, a correlation between the theoretical (calculated) collapse pressures for a number of API 5CT casing sizes and grades will be presented. The results will show that the most effective way to increase the collapse resistance of casing is to maximize the yield strength, minimize the out-of-roundness (ovality) and maximize the wall thickness of pipe. The paper will also compare the actual collapse pressures of number of casing sizes and grades with API 5CT collapse pressures.

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