Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Patent
1997-11-21
1998-10-06
Eldred, J. Woodrow
Communications: electrical
Wellbore telemetering or control
Using a specific transmission medium
3408545, 175 40, G01V 300
Patent
active
058183523
ABSTRACT:
A well data telemetry system for transmitting data along at least a part of a well bore containing tubing of magnetically permeable material comprises a transmitting coil located to transmit a magnetic flux signal along the tubing and/or the surrounding geological formations, modulation circuitry connected to the coil for modulating the magnetic flux signal in response to a data signal, and an a.c. magnetometer located to detect and respond to the magnetic flux signal at a position spaced from the transmitting coil. By using an a.c. magnetometer instead of a conventional receiver coil to detect and respond to the magnetic flux signal, the system is capable of responding to the low levels of signal which are likely to be received in practice. Furthermore, the response of the a.c. magnetometer is independent of frequency so that the system may be used at low frequencies as well as high frequencies and demodulation of the transmitted signal can be effected without difficulty.
REFERENCES:
patent: 3967201 (1976-06-01), Rorden
patent: 4072200 (1978-02-01), Morris et al.
patent: 4301408 (1981-11-01), Paddison et al.
patent: 4363137 (1982-12-01), Salisbury
patent: 4800385 (1989-01-01), Yamazaki
patent: 4992787 (1991-02-01), Helm
Eldred J. Woodrow
Integrated Drilling Services Limited
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