Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1981-11-30
1984-10-30
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Well logging
367 35, 175 45, 33304, G01V 140
Patent
active
044795645
ABSTRACT:
A measurement system detects a downhole drilling variable in relation to the rotational orientation of a drill string during drilling. The system includes a downhole reference signal generator and a downhole variable signal generator. The reference signal generator is coupled downhole to the drill string for generating a downhole reference (DR) signal indicative of the angular relationship between the angular orientation of a lower portion of the drill string about its axis and a directional reference, such as gravity or the earth's magnetic field. The downhole variable signal generator detects downhole parameters and generates a downhole variable (DV) signal representative of a downhole parameter of interest during drilling, such as the bending moment applied to the lower portion of the drill string. The phase-coherent DV signal and DR signals are thereupon processed to provide an output signal which indicates the resultant lateral force applied to the drill string at the drill bit during drilling and which is useful in projecting the probable drilling direction.
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Moskowitz Nelson
Schlumberger Technology Corporation
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