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Failure Analysis & Redesign of an Oil/Gas Threaded Joint Casing

We were asked to perform a failure analysis on a threaded joint casing at a shallow depth of about 80-100 feet near the drill bit about 30-40 feet from the bottom of the hole. These failures occurred on the male pin connection at the root of the last thread. The drilling includes two wings that expand once the bit outside the casing to create a 7 3/4 inch cutting area. Possibly while encountering an asymmetric hard formation, such as limestone, an eccentric loading occurred on the casing. This stress condition caused additional stresses on the threaded connection. We subsequently designed a new threaded profile to minimize this effect.
 

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Root Cause Investigation – Gas Well Pipe Rupture
Failure Analysis and Redesign of Threaded Closure of a Wellhead
 

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