Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1993-09-28
1995-01-10
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
G01R 3320
Patent
active
053810929
ABSTRACT:
A wellbore apparatus adapted to be disposed in a wellbore is electrically connected to a surface apparatus disposed at a surface of the wellbore. When disposed in the wellbore, the wellbore apparatus receives a plurality of input signals from an earth formation traversed by the wellbore which are representative of characteristics of the earth formation. The wellbore apparatus includes a data compression apparatus which receives the input signals and compresses the input signals prior to transmission of the compressed input signals uphole to the surface apparatus. The data compression apparatus compresses the input signals by first subdividing the plurality of input signals into a plurality of groups, where the number of the plurality of groups is much less than the number of the plurality of input signals, and then generating one value for each group. Therefore, a plurality of values corresponding, respectively, to the plurality of groups represent the compressed input signals transmitted uphole to the surface apparatus. In addition, since the plurality of values is much less in number than the plurality of input signals, the telemetry requirements needed to transmit the plurality of values uphole, relative to the telemetry requirements needed to transmit the plurality of input signals uphole, is substantially reduced.
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Bouchard John H.
Garrana Henry N.
Schlumberger Technology Corporation
Tokar Michael J.
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