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TECHNICAL PAPERS

Drillstring Stability Based on Variable Material Specific Force and Using a Sharp Three-Insert Polycrystalline Diamond Compact (PDC) Coring Bit

[+] Author and Article Information
M. A. Elsayed, L. F. Washington

Mechanical Engineering Department, University of Louisiana at Lafayette, Lafayette, LA 70504

J. Energy Resour. Technol 123(2), 138-143 (Nov 06, 2000) (6 pages) doi:10.1115/1.1367857 History: Received February 26, 1999; Revised November 06, 2000
Copyright © 2001 by ASME
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References

Figures

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A typical cutter removing an undulated surface
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Specific force for Sierra White granite, sharp cutters
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Specific force for Berea sandstone, sharp cutters
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Cutter placement on the coring bit
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Development of the area removed by each cutter
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Vector diagram indicating change in material thickness δCij of the cut area Aij due to vibration
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Process damping force associated with area Aij whose thickness variation is δCij
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Measured FRF in the axial direction of Sandia’s hard rock drilling facility
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Correlation between measured vibration and relative instability, Berea sandstone, sharp cutters, WOB=500 lb
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Correlation between measured vibration and relative instability, Sierra White granite, sharp cutters, WOB=1500 lb

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