Drillstring Vibration and Wellbore Instability
Author:
Pla´cido Joa˜o Carlos R.1, Santos He´lio M. R.1, Galeano Yadira Diaz1
Affiliation:
1. PETROBRAS-CENPES, Cidade Universitaria, Q–7 21949-900, Rio de Janeiro, RJ, Brazil
Abstract
Wellbore instability can be attributed to several causes. The ones thought to be most important include: chemical interaction with the drilling fluid, high tectonic stresses, and insufficient mud weight. Drillstring vibration, although not traditionally addressed as a potential cause, might influence the stability of wellbores drilled in specific formations. Evidence of the strong correlation between severe vibration and wellbore instability has been reported in the literature. However, a more thorough understanding of the phenomenon is still lacking. This paper describes a study that has been developed by PETROBRAS focusing on how drillstring vibration impacts wellbore instability. Vibration has been monitored in some wells, and events related to borehole enlargement were observed. Four field cases are presented showing a strong correlation between high vibration level and wellbore enlargement in different lithologies. Other sources of wellbore enlargement have also been identified, and they can be clearly separated from vibration.
Publisher
ASME International
Subject
Geochemistry and Petrology,Mechanical Engineering,Energy Engineering and Power Technology,Fuel Technology,Renewable Energy, Sustainability and the Environment
Reference11 articles.
1. Santos, H. M, Pla´cido J. C. R., and Wolter C., 1999, “Consequences and Relevance of Drillstring Vibration on Wellbore Stability,” SPE/IADC 52820, Amsterdam, The Netherlands. 2. Santos, H. M., 1997, “A New Conceptual Approach to Shale Stability,” Ph.D. dissertation, School of Petroleum & Geological Engineering, University of Oklahoma, OK. 3. Dunayevsky, V. A., Abbassian, F., and Judzis, A., 1993, “Dynamic Stability of Drillstrings under Fluctuating Weight on Bit,” SPE Drilling and Completion, June, 84. 4. Dykstra, M. W., Chen, D. C-K., Warren, T. M., and Azar, J. J., 1995, “Drillstring Component Mass Imbalance: A Major Source of Downhole Vibrations,” SPE/IADC 29350, Amsterdam, The Netherlands. 5. Besaisow, A. A., and Payne, M. L., 1988, “A Study of Excitation Mechanisms and Resonances Inducing Bottomhole Assembly Vibrations,” SPE Drilling Engineer, Mar. 93.
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