Communications: electrical – Wellbore telemetering or control – In horizontal or inclined passage arrangement
Patent
1981-02-11
1983-11-15
Moskowitz, Nelson
Communications: electrical
Wellbore telemetering or control
In horizontal or inclined passage arrangement
340857, 181103, 324339, G01V 140, G01V 313, E21B 2902
Patent
active
044158955
ABSTRACT:
A telemetering system provides improved cable utilization and bi-directional digital communication between a logging sonde and surface electronics over a single balanced transmission line of a multi-conductor logging cable, with significant signal crosstalk reductions. Receiver circuitry downhole decodes pulses delivered on the line from a surface logic generator which fire transmitter-receiver pairs of an acoustic logging tool in an order defined by the pulses. A PCM transmitter in the sonde thereafter samples data generated by other logging instruments, encodes this information into digital data frames, and transmits the data on the same line to a surface PCM receiver. Circuitry limits surface and downhole receiver response to PCM transmitter and logic generator pulses, respectively. A center tap of the same transmission line also provides for simultaneous noise-free transmission of sensitive low level signals such as remote surface potential and the like to the sonde.
REFERENCES:
patent: 3356990 (1967-12-01), Sloughter
patent: 3707700 (1972-12-01), Lafont
patent: 3773109 (1973-11-01), Eberline
patent: 3991611 (1976-11-01), Marshall et al.
patent: 4028660 (1977-06-01), Pitts, Jr.
patent: 4123744 (1978-10-01), Ingram
patent: 4296412 (1981-10-01), Mastner
patent: 4319192 (1982-03-01), Chemali et al.
"Bidirectional Telemetry for Downhole Well Logging," by Thomas S. Matthews, Petroleum Engineer, Sep. 1977.
Byron Richard M.
Dresser Industries Inc.
McCollum Patrick H.
Moskowitz Nelson
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