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Keywords: relief feature
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Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference, March 15–18, 1987
Paper Number: SPE-16072-MS
... FAILURES ANALYSIS and DISCUSSION Perhaps the most obvious characteristic of our drill collar failures is that 97% of the failures occured at the box end of the drill collars (see Table 1.). P. 177^ collar failure drill collar operation relief feature drill pipe selection inspection...

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