Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2003-11-21
2008-09-02
Williams, Hezron E. (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S152010, C073S152020, C073S152180, C181S102000, C367S025000
Reexamination Certificate
active
07418865
ABSTRACT:
The disclosure relates to methods and apparatus for determining the velocity of an ultrasound pulse in drilling fluids in downhole environments. A method for determining a velocity of ultrasound propagation in a drilling fluid in a downhole environment includes emitting an ultrasound pulse into the drilling fluid in a borehole using a first ultrasound transducer (37); detecting the ultrasound pulse after the ultrasound pulse has traveled a distance (d); determining a travel time (t) required for the ultrasound pulse to travel the distance (d); and determining the velocity of ultrasound propagation from the known distance (d) and the travel time (t). An apparatus for determining a velocity of ultrasound propagation in a drilling fluid in a downhole environment includes a first ultrasound transducer (37) disposed on a tool; and a circuitry (82) for controlling a timing of an ultrasound pulse transmitted by the first ultrasound transducer (37) and for measuring a time lapse between ultrasound transmission and detection after the ultrasound pulse has traveled a distance (d).
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Griffiths Roger
Pabon Miguel
Castano Jaime
Saint-Surin Jacques M.
Schlumberger Technology Corporation
Williams Hezron E.
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