Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Patent
1991-04-12
1992-08-18
Eldred, J. Woodrow
Communications: electrical
Wellbore telemetering or control
Using a specific transmission medium
3408549, 3408551, 73151, 166 66, 175 40, G01V 100
Patent
active
051403188
ABSTRACT:
A data transmission system for use with such as the seven conductor logging cable that functions to provide more precise transmission of data signal with reduced interference from higher powered electrical signals present along the line. The data signals are modulated on a radio frequency carrier which is then inductively coupled to the cable jacket or shielding sheath for conduction along the cable. Thus, as the logging cable supports a downhole tool in a borehole, transmitter/receiver combinations both downhole and at the surface can communicate via modulated RF signal conducted along the standard shielding material of the cable. A primary advantage to this type of transmission is the fact that no signal must reverberate through the cable reel as it can be inductively picked off prior to the cable entering the reel section, resulting in much reduced attenuation and interference.
REFERENCES:
patent: 2505144 (1950-04-01), Rutherford
patent: 3916685 (1975-11-01), Paap et al.
patent: 4017845 (1977-04-01), Kilian et al.
patent: 4136327 (1979-01-01), Flanders et al.
patent: 4156869 (1979-05-01), Schukantz
patent: 4302757 (1981-11-01), Still
patent: 4893496 (1990-01-01), Bau et al.
Conoco Inc.
Eldred J. Woodrow
LandOfFree
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