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Torsional Vibration Control and Cosserat Dynamics of a Drill-Rig Assembly.

Research output: Contribution to journalJournal article

Published

Journal publication date01/2003
JournalMeccanica
Journal number1
Volume38
Number of pages17
Pages145-161
Original languageEnglish

Abstract

Aspects of drill-string vibrations in the context of a recently developed integrated model of a drill-rig assembly based on the Cosserat theory of rods are discussed. Computer simulations are used to compare existing rotary feedback strategies currently in use to optimise drilling performance where torsional slip-stick vibrations are a hazard. Guided by the wave nature of axial and torsional vibrations in axially symmetric drill-string configurations, we present a new control mechanism, torsional rectification, and compare its performance with existing controllers within the context of the model. The practical guidelines for the improvement of drilling rates in a wide variety of circumstances are discussed.