Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1974-11-01
1976-09-14
Smith, Alfred E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250253, 250256, 340 18CM, G01V 122, G01V 140, G01V 500
Patent
active
039808815
ABSTRACT:
An improved well logging system of the type utilizing a single conductor cable to provide power from the surface equipment to a down hole subsurface unit and for simultaneously supplying current mode telemetry signals from one or more radiation detectors in the subsurface unit to the surface equipment. The surface equipment includes a power supply for the subsurface unit comprising a constant current source having a high output impedance connected to a series pass voltage regulator having a low output impedance. A switching mode voltage regulator is employed within the subsurface unit to compensate for variations in the voltage supplied to the subsurface unit which result from variations in cable resistance and other factors.
The subsurface unit includes circuitry capable of operating at the high temperature encountered in deep wells for an extended period of time and which transforms the detector output signals into corresponding current mode telemetry signals which are supplied over the single conductor cable to the low impedance output terminals of the series pass voltage regulator at the surface. The current mode signals are transformed by the series pass voltage regulator and appear as amplified voltage signals at the high impedance junction of the constant current source and the series pass regulator. Demultiplexing and recording circuitry is connected to the aforementioned junction to receive the amplified voltage signals and develop corresponding rate meter signals which may be applied to a recorder in the surface equipment.
REFERENCES:
patent: 2433554 (1947-12-01), Herzog
patent: 2686268 (1954-08-01), Martin et al.
patent: 2760078 (1956-08-01), Youmans
patent: 2842695 (1958-07-01), Goodman
patent: 3368195 (1968-02-01), Peterson
patent: 3495212 (1970-02-01), Brock
Ferguson Wesley E.
Veach Charley L.
Wiley Ralph
Chin Tommy P.
Smith Alfred E.
The Western Company of North America
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