Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Patent
1979-08-10
1981-03-03
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through drill string or casing
330284, 328167, G01V 140
Patent
active
042544815
ABSTRACT:
In a borehole telemetry system for acoustically transmitting data over a pipe suspended in a borehole, the level of noise encountered requires the use of specific frequencies to transmit data. Any drift in electrical circuits which might affect or be affected by such use of precise frequencies is undesirable. An automatic gain control (AGC) circuit is provided which obtains its feedback from a signal which has undergone some noise filtering so that the AGC circuit is controlled by a signal having a high signal-to-noise ratio. The circuit is arranged so that the wide temperature variations occurring in a downhole environment as well as component deterioration or change do not affect the frequency of the data signal or operation of the system in dealing with a precise frequency.
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Crider et al., "Crosstalk Eliminator", 9/75, pp. 987-988, IBM Tech. Disc. Bull., vol. 18, #4.
Smither Miles A.
Vela Octavio A.
Moskowitz Nelson
Murrah M. L.
Sperry-Sun, Inc.
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