Communications: electrical – Selective – Interrogation response
Patent
1976-12-15
1978-08-15
Birmiel, Howard A.
Communications: electrical
Selective
Interrogation response
340 18P, 179 15BS, G01V 140
Patent
active
041076443
ABSTRACT:
A data transmission system, for a well logging system having a logging tool logging a borehole traversing an earth formation and surface equipment adjacent to the borehole for making a well log, includes a sync word generator located in the logging tool, which periodically provides a predetermined digital signal corresponding to at least one sync word. A phase encoder located in the logging tool receives the data in serial digital form and the sync word. The phase encoder provides a phase encoded signal, corresponding to the data and to the sync word, at a predetermined frequency. A cable drive receives the phase encoded signal and provides it to a cable for transmissin up-hole. The surface equipment includes a phase decoder connected to the cable for decoding the phase coded signal to provide at a serial digital signal. An output circuit at the surface provides parallel digital signals in accordance with the serial digital signal corresponding to the sync words and the data.
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Birmiel Howard A.
Gillespie Ronald G.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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