Despite extensive investigation by the drilling and researchcommunity, vibration-related bottom-hole-assembly (BHA)failures are still common today. There are many theoreticalforms of vibration that have been described in industryliterature. Having to address multiple forms simultaneously,vibration mitigation procedures are often overly complex andineffective.An extensive study of high-resolution vibration data wasundertaken to identify primary forms of destructive motion.Consistencies in BHA behavior were identified from thisstudy and revealed that specific BHA’s regularly demonstratefundamental vibration tendencies in specific environments. Asa result, a more focused procedure for corrective action hasbeen adapted and implemented. This procedure has beenproven effective without significant negative economic impactto the drilling operation.This paper discusses the findings of the study. Morespecifically it addresses the destructive motion of bi-centerassemblies. Data from two field examples will be highlightedfor practical application.
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