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Drillstring Mechanics Model for Surveillance, Root Cause Analysis, and Mitigation of Torsional Vibrations

Authors
Deniz Ertas (ExxonMobil Research & Engineering) | Jeffrey R Bailey (ExxonMobil Development Company) | Lei Wang (ExxonMobil Upstream Research Company) | Paul E. Pastusek (ExxonMobil Development Company)
DOI
https://doi.org/10.2118/163420-PA
Document ID
SPE-163420-PA
Publisher
Society of Petroleum Engineers
Source
SPE Drilling & Completion
Volume
29
Issue
04
Publication Date
December 2014
Document Type
Journal Paper
Pages
405 - 417
Language
English
ISSN
1064-6671
Copyright
2014.Society of Petroleum Engineers
Keywords
surface measurements, stick-slip vibrations, torsional vibrations, vibrations surveillance, drillstring modeling
Downloads
5 in the last 30 days
854 since 2007
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SPE Member Price: USD 12.00
SPE Non-Member Price: USD 35.00

Vibrations have been identified as one of the most-frequent and persistent performance limiters by limiting weight on bit, rate of penetration, or borehole quality even when they may be low enough not to cause damage to downhole tools and equipment. A general purpose drillstring mechanics model has been developed to analyze axial and torsional vibrations in the frequency domain and provide vibration indices indicative of dysfunction in these modes. The model uses transfer matrices to solve for harmonic perturbations around a baseline solution obtained from a torque/drag type analysis, and accounts for effects of well path, tool joints, viscous damping caused by the drilling fluid, surface boundary conditions, bit characteristics, and special vibration mitigation tools. The model supports workflows for real-time vibration surveillance as well as post-drill root cause analysis and well redesign. For example, real-time stick/slip severity monitoring is enabled by use of 1-second surface measurements. As a well redesign tool, a large number of design alternatives can be quickly evaluated to mitigate vibrations. Case studies using high-frequency surface/downhole drilling mechanics data validated the model and identified three types of torsional dysfunctions with distinct signatures and mitigators: unstable stick/slip, an instability associated mostly with the lowest- frequency torsional resonance of the drillstring; bit/bottomhole assembly stall, which is intermittent, sudden mechanical jamming at the bottom of the drillstring; and synchronous torsional oscillation, which is the amplification of periodic excitations at torsional resonances of the drillstring. In one case study, the stick/slip surveillance tool was superior to real-time downhole measurements in lag time, bandwidth, and accuracy. In another case, the root cause of prevalent unstable stick/slip was identified as velocity-weakening aggressiveness of the bit. Of the redesign options, the use of a topdrive controller tuned to damp out the lowest-frequency torsional resonance was deemed most effective. One such controller was evaluated in the field and was very effective at mitigating stick/slip in subsequent wells.

File Size  1 MBNumber of Pages   13

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