Despite extensive investigation by the drilling and research community, vibration-related bottom-hole-assembly (BHA) failures are still common today. There are many theoretical forms of vibration that have been described in industry literature. Having to address multiple forms simultaneously, vibration mitigation procedures are often overly complex and ineffective. An extensive study of high-resolution vibration data was undertaken to identify primary forms of destructive motion. Consistencies in BHA behavior were identified from this study and revealed that specific BHA’s regularly demonstrate fundamental vibration tendencies in specific environments. As a result, a more focused procedure for corrective action has been adapted and implemented. This procedure has been proven effective without significant negative economic impact to the drilling operation. This paper discusses the findings of the study. More specifically it addresses the destructive motion of bi-center assemblies. Data from two field examples will be highlighted for practical application.
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