Communications: electrical – Selective – Interrogation response
Patent
1975-03-31
1977-03-15
Moskowitz, Nelson
Communications: electrical
Selective
Interrogation response
340 155BH, 340 18P, 181102, 181103, 324 5G, G01V 140
Patent
active
040127125
ABSTRACT:
In the particular embodiments described, a telemetering system for well logging receives and temporarily stores binary-coded parallel data in a downhole memory unit and continuously interrogates and transmits the stored data to the surface at fixed rate in binary-coded serial format. The system thus accommodates high instantaneous data-generation rates, such as are encountered, for example, in gamma ray spectroscopy tools, without loss of information on the cable. The stored data is compacted, by suppressing leading zeros in data words, prior to application to the cable. This affords faster memory read-out and reduces cable transmission time. The data word format and signal format utilized on the cable provide low error-rate data flow to the surface, as well as facilitating the maintenance of synchronous operation between downhole and uphole functions. In one embodiment, the system also includes multiplexed access to the memory unit for data generated both at random and at predetermined intervals, thereby enabling different types of information to be obtained with a single logging tool.
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Evans, "Status and Trends in Logging," 2/70, pp. 93-112, Geophysics, vol. 35, No. 1.
Moskowitz Nelson
Schlumberger Technology Corporation
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