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On the Effective Control of Torsional Vibrations in Drilling Systems

โœ Scribed by W.R. Tucker; C. Wang

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
837 KB
Volume
224
Category
Article
ISSN
0022-460X

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โœฆ Synopsis

This paper analyses a control mechanism designed to signiยฎcantly ameliorate the sustained excitation of torsional relaxation oscillations (slipยฑstick) due to frictional torques generated by an active bit during drilling operations with an extended drill-string. The proposed mechanism of torsional rectiยฎcation is compared with existing soft-torque devices in a series of mathematical models. Both analytic and numerical simulations indicate that many of the volatilities suered by existing soft-torque feedback approaches used to combat slipยฑstick can be eliminated by the alternative proposed here.

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