Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Reexamination Certificate
2006-05-02
2006-05-02
Bagnell, David (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
C175S320000, C188S267000, C188S267100, C188S267200
Reexamination Certificate
active
07036612
ABSTRACT:
A damping apparatus and method for a drillstring comprising a bit comprising providing to the drillstring a damping mechanism comprising magnetorheological fluid and generating an electromagnetic field affecting the magnetorheological fluid in response to changing ambient conditions encountered by the bit.
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Elsayed, M.A., et al., “Effect of Downhole Assembly and Polycrystalline Diamond Compact (PDC) Bit Geometry on Stability of Drillstrings,”Journel of Energy Resources Technology, vol. 119, pp 159-163 (Sep. 1997).
Elsayed, M.A., “Correlation Between Bit Chatter, Weight on the Bit, and Rate of Penetration in Drillstrings Equipped with PDC Bits,”ASME ETCE Conference Proceedings, Houston TX, pp 1-8 (1999).
Elsayed, M.A., et al., “Measurement and Analysis of Chatter in a Compliant Model of a Drillstring Equipped with a PDC Bit,”ASME ETCE Conference Proceedings, New Orleans LA, pp 1-8 (2000).
Elsayed, M.A., et al., “Analysis of Coupling Between Axial and Torsional Vibration in a Compliant Model of a Drillstring Equipped with a PDC Bit,”ASME ETCE Conference Proceedings, Houston TX, paper #ETCE 2002/Struc-29002 (Feb. 2002), pp. 1-8.
Glowka, D.A., “Use of Single-Cutter Data in the Analysis of PDC Bit Designs: Parts 2—Development and Use of the PDCWEAR Computer Code,”J. Petroleum Technology, pp 850-859 (Aug. 1989).
Thompson, William T., Textbook: Theory of Vibration with Applications, Prentice-Hall, Inc., Englewood Cliffs, NJ, table of contents (1981).
Elsayed Mostafa Ahmed
Raymond David W.
Bagnell David
Collins Giovanna M.
Myers Jeffrey D.
Sandia Corporation
Watson Robert D.
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