Measuring and testing – Borehole or drilling – During drilling
Reexamination Certificate
2006-08-01
2006-08-01
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
During drilling
C073S152430, C073S152460, C073S649000, C073S650000, C175S040000, C175S048000, C175S050000
Reexamination Certificate
active
07082821
ABSTRACT:
A method and apparatus for detecting torsional vibration, or stick-slip, in a drill string while drilling is described. The method comprises sampling a downhole pressure sensor and using embedded filter schemes and algorithms to determine, based on the pressure samples, whether torsional vibration is occurring in the drill string. The method may also include sending a warning signal to the surface of the well. The apparatus comprises a downhole assembly having a downhole receiver and a master controller. The downhole receiver comprises a pressure sensor, filter schemes, and algorithms for detecting torsional vibration. The downhole assembly may also include a downhole transmitter for sending a warning signal to the surface of the well.
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Beene Paul D.
Chen Chen-Kang David
Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
Rogers David A.
Williams Hezron
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