API REPORT 80-30B Collapse Resistance of Mill Selected High Collapse Grade 95 Casing

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API REPORT 80-30B Document Information:

Title
Collapse Resistance of Mill Selected High Collapse Grade 95 Casing

American Petroleum Institute

Publication Date:
Aug 1, 1987

Scope:

EXECUTIVE SUMMARY

This report describes the procedures and results of a project performed at Southwest Research Institute (SwRI) for the purpose of assessing the collapse resistance of mill selected High Collapse Grade 95 (HC-95) casing. One-hundred-and-eight pieces of casing were tested which represent the most popular sizes and weights currently in use. Dimensional properties, coupon material properties and residual stresses Were measured and correlated with failure values. Empirical formulas for predicting collapse failure are given.

The results show that the industry is capable of producing HC-95 casing with superior collapse performance properties. The minimum collapse pressures currently published by the manufacturers are safe for the casing tested. For D/t ratios of 19-1/2 and greater the manufacturers' values closely agree with the minimum values determined by statistical methods. At D/t ratios of 19-1/2 and less, the manufacturers' values are lower than the statistical minimum values.

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